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{{short description|Atlantic subtropical storm in 2007}}
{{Short description|Atlantic subtropical storm in 2007}}
{{Infobox Hurricane
{{Infobox weather event
| Name=Subtropical Storm Andrea
| name = Subtropical Storm Andrea
| image = Andrea 2007-05-09 1615Z.png
| Type=Subtropical storm
⚫
| caption = Andrea shortly after being classified as a subtropical storm, on May 9
⚫
| Year=2007
⚫
| formed = May 9, 2007
| Basin=Atl
⚫
| extratropical = May 11, 2007
| Image location=Subtropical Storm Andrea (2007).JPG
| dissipated = May 14, 2007
⚫
| Image name=Andrea shortly before being classified as a subtropical storm, on May 8
}}{{Infobox weather event/NWS
⚫
| Formed=May 9, 2007
⚫
| winds = 50
⚫
| Dissipated=May 14, 2007
⚫
| pressure = 1001
| Extratropical=May 11
| category = subtropical
⚫
| 1-min winds=50
}}{{Infobox weather event/Effects
⚫
| Pressure=1001
⚫
| year = 2007
| Damages=Unknown
| Fatalities=6 indirect
| fatalities = 6 indirect
| damage-suffix = Minimal
| Inflated=
| Areas=[[Virginia]], [[Southeastern U.S.]], [[Bahamas]]
| areas = [[Virginia]], [[Southeastern U.S.]], [[Bahamas]]
| refs =
⚫
| Hurricane season=[[2007 Atlantic hurricane season]]
}}{{Infobox weather event/Footer
⚫
| season = [[2007 Atlantic hurricane season]]
}}
}}
'''Subtropical Storm Andrea''' was the first [[Tropical cyclone naming#named storm|named storm]] and the first [[subtropical cyclone]] of the [[2007 Atlantic hurricane season]]. Andrea developed out of a non-tropical [[low-pressure area|low]] on May 9 about 150 miles (240 km) northeast of [[Daytona Beach, Florida]], three weeks before the official start of the season. After encountering dry air and strong vertical [[wind shear]], Andrea weakened to a subtropical depression on May 10 while remaining nearly stationary, and the [[National Hurricane Center]] discontinued advisories early on May 11. Andrea's remnant was subsequently absorbed into another extratropical storm on May 14. Andrea was the first pre-season storm to develop since [[Tropical Storm Ana (2003)|Tropical Storm Ana]] in April 2003. Additionally, the storm was the first Atlantic named storm in May since [[1981 Atlantic hurricane season#Tropical Storm Arlene|Tropical Storm Arlene]] in 1981.{{Atlantic hurricane best track}}
'''Subtropical Storm Andrea''' was the first named storm to form in May in the [[Atlantic Ocean]] in [[1981 Atlantic hurricane season|26 years]]. Andrea caused large waves and tropical-storm force winds along the southeast coast of the [[United States]]. The first [[Tropical cyclone naming#named storm|named storm]] and the first [[subtropical cyclone]] of the [[2007 Atlantic hurricane season]], Andrea developed out of a non-tropical [[low-pressure area|low]] on May 9 about {{convert|150|mi|km}} northeast of [[Daytona Beach, Florida]], three weeks before the official start of the season. After encountering dry air and strong vertical [[wind shear]], Andrea weakened to a subtropical depression on May 10 while remaining nearly stationary, and the [[National Hurricane Center]] discontinued advisories early on May 11. Andrea's remnant was subsequently absorbed into another [[Extratropical cyclone|extratropical storm]] on May 14. Andrea was the first pre-season storm to develop since [[Tropical Storm Ana (2003)|Tropical Storm Ana]] in April 2003. Additionally, the storm was the first Atlantic named storm in May since [[Tropical Storm Arlene (1981)|Tropical Storm Arlene]] in 1981.{{Atlantic hurricane best track}}


The storm produced rough surf along the coastline from [[Florida]] to [[North Carolina]], causing [[coastal erosion|beach erosion]] and some damage. In some areas, the waves eroded up to 20 feet (6 m) of beach, leaving 70 homes in danger of collapse. Offshore [[North Carolina]], high waves of 34 feet (10 m) and tropical-storm-force winds damaged three boats; their combined nine passengers were rescued by the [[United States Coast Guard|Coast Guard]], although all nine sustained injuries. Light rainfall was also reported in some coastal locations. Damage was minimal, but six people drowned as a result of the storm.
The storm produced rough surf along the coastline from [[Florida]] to [[North Carolina]], causing [[coastal erosion|beach erosion]] and some damage. In some areas, the waves eroded up to {{convert|20|ft|m}} of beach, leaving 70 homes in danger of collapse. Offshore [[North Carolina]], high waves of {{convert|34|ft|m}} and tropical-storm-force winds damaged three boats; their combined nine passengers were rescued by the [[United States Coast Guard|Coast Guard]], although all nine sustained injuries. Light rainfall was also reported in some coastal locations. Damage was minimal, but six people drowned as a result of the storm.


== Meteorological history ==
== Meteorological history ==
{{storm path|Andrea 2007 track.png}}
{{storm path|Andrea 2007 track.png}}
In early May, an upper-level [[trough (meteorology)|trough]] dropped southward through the western [[Atlantic Ocean]], forcing a back-door cold front—a [[cold front]] that moves southwestward ahead of a building surface [[ridge (meteorology)|ridge]] to its north or northeast—southward. For several days, [[Tropical cyclone prediction model|forecast models]] had anticipated for the trough to evolve into a closed [[low pressure area]],<ref name="54twd">{{cite web|author=Cangialosi|year=2007|title=May 4 Tropical Weather Discussion|publisher=[[National Hurricane Center]]|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705041743.txt|archive-url=https://web.archive.org/web/20170507091540/http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705041743.txt|archive-date=2017-05-07}}</ref> and on May 6, a frontal low with a large and well-defined circulation developed about 90&nbsp;miles (140&nbsp;km) east of [[Cape Hatteras]]. The low maintained scattered [[atmospheric convection|convection]] around its circulation center, and in conjunction with the strong high pressure to its north, a very tight [[pressure gradient (atmospheric)|pressure gradient]] produced gale-force winds near the coastline.<ref name="57twd">{{cite web|author=Cangialosi|year=2007|title=May 6 Tropical Weather Discussion|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705062343.txt}}</ref> The extratropical storm tracked southeastward and later turned to the southwest while steadily deepening; on May 7, it attained hurricane-force winds.<ref name="tcr">{{cite web|author1=Jamie R. Rhome|author2=Jack Beven|author3=Mark Willis|last-author-amp=yes|year=2007|title=Subtropical Storm Andrea Tropical Cyclone Report|publisher=National Hurricane Center|accessdate=2007-07-02|url={{NHC TCR url|id=AL012007_Andrea}}}}</ref> With a lack of tropical moisture, its corresponding convection was minimal and scattered.<ref name="57twd2">{{cite web|author=Cangialosi|year=2007|title=May 7 Tropical Weather Discussion|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705072341.txt}}</ref>
In early May, an upper-level [[trough (meteorology)|trough]] dropped southward through the western [[Atlantic Ocean]], forcing a back-door cold front—a [[cold front]] that moves southwestward ahead of a building surface [[ridge (meteorology)|ridge]] to its north or northeast—southward. For several days, [[Tropical cyclone prediction model|forecast models]] had anticipated for the trough to evolve into a closed [[low pressure area]],<ref name="54twd">{{cite web|author=Cangialosi|year=2007|title=May 4 Tropical Weather Discussion|publisher=[[National Hurricane Center]]|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705041743.txt|archive-url=https://web.archive.org/web/20170507091540/http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705041743.txt|archive-date=2017-05-07}}</ref> and on May 6, a frontal low with a large and well-defined circulation developed about {{convert|90|mi|km}} east of [[Cape Hatteras]]. The low maintained scattered [[atmospheric convection|convection]] around its circulation center, and in conjunction with the strong high pressure to its north, a very tight [[pressure gradient (atmospheric)|pressure gradient]] produced gale-force winds near the coastline.<ref name="57twd">{{cite web|author=Cangialosi|year=2007|title=May 6 Tropical Weather Discussion|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705062343.txt}}</ref> The extratropical storm tracked southeastward and later turned to the southwest while steadily deepening; on May 7, it attained [[Beaufort scale|hurricane-force]] winds.<ref name="tcr">{{cite web|author1=Jamie R. Rhome|author2=Jack Beven|author3=Mark Willis|name-list-style=amp|year=2007|title=Subtropical Storm Andrea Tropical Cyclone Report|publisher=National Hurricane Center|access-date=2007-07-02|url={{NHC TCR url|id=AL012007_Andrea}}}}</ref> On the same day, the storm reached its extratropical peak, with a minimum central pressure of {{convert|988|mbar|inHg}}.<ref name="tcr" /> With a lack of tropical moisture, the storm's corresponding convection was minimal and scattered.<ref name="57twd2">{{cite web|author=Cangialosi|year=2007|title=May 7 Tropical Weather Discussion|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705072341.txt}}</ref>


The [[National Hurricane Center]] first mentioned the possibility of [[tropical cyclogenesis]] on May 8, while the storm was located about 230&nbsp;miles (370&nbsp;km) east-southeast of the [[South Carolina]] coastline. Its associated [[convection]] had steadily increased as it tracked slowly westward at 5–10&nbsp;mph (8–16&nbsp;km/h).<ref name="may8stds">{{cite web|author=Knabb|year=2007|title=May 8 Special Tropical Disturbance Statement|publisher=National Hurricane Center|accessdate=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705081346.txt}}</ref> The system changed little in organization throughout the day,<ref name="may9stds">{{cite web|author=Brown|year=2007|title=May 9 Special Tropical Disturbance Statement|publisher=National Hurricane Center|accessdate=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705090312.txt}}</ref> though by the following morning, hurricane specialists indicated the low was acquiring [[subtropical cyclone|subtropical characteristics]]<ref name="stdsmay9">{{cite web|author=Franklin/Knabb|year=2007|title=May 9 Special Tropical Disturbance Statement (2)|publisher=National Hurricane Center|accessdate=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705091303.txt}}</ref> as it tracked over progressively warmer waters.<ref name="tcr" /> Early on May 9, a [[Hurricane Hunters]] flight into the system revealed winds of 45&nbsp;mph (70&nbsp;km/h) and a flat thermal core, which indicated the system was neither [[warm core|warm-core]] nor [[cold-core low|cold-core]]. In addition, satellite imagery indicated a consolidation of the convection near the center, as well as hints of upper-level [[outflow (meteorology)|outflow]] and a contraction of the [[radius of maximum wind]]s from more than 115&nbsp;miles (185&nbsp;km) to about 70&nbsp;miles (120&nbsp;km). Based on the observations and the hybrid structure of the system, the National Hurricane Center classified the low as Subtropical Storm Andrea at 1500&nbsp;[[Coordinated Universal Time|UTC]] on May 9 about 150&nbsp;miles (240&nbsp;km) northeast of [[Daytona Beach, Florida]].<ref name="disc1">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Discussion One|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.001.shtml}}</ref> During a subsequent analysis of the storm, researchers estimated that the storm had transitioned into a subtropical cyclone nine hours earlier.<ref name="tcr" /> As Andrea developed before June 1—the traditional start of hurricane seasons in the Atlantic Ocean—it became the first pre-season storm since [[Tropical Storm Ana (2003)|Tropical Storm Ana]] in April&nbsp;2003. Additionally, the storm was the first Atlantic named storm in May since [[1981 Atlantic hurricane season#Tropical Storm Arlene|Tropical Storm Arlene]] in&nbsp;1981.{{Atlantic hurricane best track}}
The [[National Hurricane Center]] first mentioned the possibility of [[tropical cyclogenesis]] on May 8, while the storm was located about {{convert|230|mi|km}} east-southeast of the [[South Carolina]] coastline. Its associated [[convection]] had steadily increased as it tracked slowly westward at {{convert|5|–|10|mph|km/h|abbr=on}}.<ref name="may8stds">{{cite web|author=Knabb|year=2007|title=May 8 Special Tropical Disturbance Statement|publisher=National Hurricane Center|access-date=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705081346.txt}}</ref> The system changed little in organization throughout the day,<ref name="may9stds">{{cite web|author=Brown|year=2007|title=May 9 Special Tropical Disturbance Statement|publisher=National Hurricane Center|access-date=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705090312.txt}}</ref> though by the following morning, hurricane specialists indicated the low was acquiring [[subtropical cyclone|subtropical characteristics]]<ref name="stdsmay9">{{cite web|author=Franklin/Knabb|year=2007|title=May 9 Special Tropical Disturbance Statement (2)|publisher=National Hurricane Center|access-date=2007-05-09|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705091303.txt}}</ref> as it tracked over progressively warmer waters.<ref name="tcr" /> Early on May 9, a [[Hurricane Hunters]] flight into the system revealed winds of {{convert|45|mph|km/h|abbr=on}} and a flat thermal core, which indicated the system was neither [[warm core|warm-core]] nor [[cold-core low|cold-core]]. In addition, satellite imagery indicated a consolidation of the convection near the center, as well as hints of upper-level [[outflow (meteorology)|outflow]] and a contraction of the [[radius of maximum wind]]s from more than {{convert|115|mi|km}} to about {{convert|70|mi|km}}. Based on the observations and the hybrid structure of the system, the National Hurricane Center classified the low as Subtropical Storm Andrea at 1500&nbsp;[[Coordinated Universal Time|UTC]] on May 9 about {{convert|150|mi|km}} northeast of [[Daytona Beach, Florida]].<ref name="disc1">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Discussion One|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.001.shtml}}</ref> During a subsequent analysis of the storm, researchers estimated that the storm had transitioned into a subtropical cyclone nine hours earlier.<ref name="tcr" /> As Andrea developed before June 1—the traditional start of hurricane seasons in the Atlantic Ocean—it became the first pre-season storm since [[Tropical Storm Ana (2003)|Tropical Storm Ana]] in April&nbsp;2003. Additionally, the storm was the first Atlantic named storm in May since [[Tropical Storm Arlene (1981)|Tropical Storm Arlene]] in&nbsp;1981.{{Atlantic hurricane best track}}


[[File:Maystormvapor.gif|right|thumb|A satellite animation of the formation of Subtropical Storm Andrea, as seen in water-vapor imagery]]
[[File:Maystormvapor.gif|right|thumb|A satellite animation of the formation of Subtropical Storm Andrea, as seen in water-vapor imagery]]
Upon first becoming a subtropical cyclone, Andrea was embedded within a large, nearly stationary [[trough (meteorology)|deep-layer trough]], resulting in a westward movement. Drifting over [[sea surface temperature]]s of no more than 77&nbsp;°&nbsp;[[Fahrenheit|F]] (25&nbsp;°C),<ref name="disc1" /> the organization of the system deteriorated with a significant decrease in convection.<ref name="disc2">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Discussion Two|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.002.shtml}}</ref> By early on May 10, much of the associated weather was located to the east of the cyclone within a [[tropical cyclone#Physical structure|band]] of moderate convection due to a brief spell of westerly vertical [[wind shear]]. The center of circulation had become disorganized, with several small cloud swirls within the larger circulation.<ref name="disc3">{{cite web|author=Avila|year=2007|title=Subtropical Storm Andrea Discussion Three|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.003.shtml}}</ref> This disorganization of the center, combined with increasing wind shear and dry air suppressing convective activity, caused it to begin weakening later that morning.<ref name="disc4">{{cite web|author=Mainelli|year=2007|title=Subtropical Storm Andrea Discussion Four|publisher=National Hurricane Center|accessdate=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.004.shtml}}</ref> By 1500&nbsp;UTC on May 10, only a few thunderstorms remained near the center, and thus the NHC downgraded Andrea to subtropical depression status.<ref name="disc5">{{cite web|author=Knabb|year=2007|title=Subtropical Depression Andrea Discussion Five|publisher=National Hurricane Center|accessdate=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.005.shtml?}}</ref> Though a few intermittent thunderstorms persisted over the eastern semicircle, the depression remained disorganized and weak; the National Hurricane Center discontinued advisories early on May 11, after it had been without significant deep convection for 18&nbsp;hours about 80&nbsp;miles (125&nbsp;km) northeast of [[Cape Canaveral, Florida]].<ref name="disc7">{{cite web|author=Rhome|publisher=National Hurricane Center|year=2007|title=Subtropical Depression Andrea Discussion Seven|accessdate=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.007.shtml?}}</ref>
Upon first becoming a subtropical cyclone, Andrea was embedded within a large, nearly stationary [[trough (meteorology)|deep-layer trough]], resulting in a westward movement. Drifting over [[sea surface temperature]]s of no more than 77&nbsp;°&nbsp;[[Fahrenheit|F]] (25&nbsp;°C),<ref name="disc1" /> the organization of the system deteriorated with a significant decrease in convection.<ref name="disc2">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Discussion Two|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.002.shtml}}</ref> By early on May 10, much of the associated weather was located to the east of the cyclone within a [[rainband|band]] of moderate convection due to a brief spell of westerly vertical [[wind shear]]. The center of circulation had become disorganized, with several small cloud swirls within the larger circulation.<ref name="disc3">{{cite web|author=Avila|year=2007|title=Subtropical Storm Andrea Discussion Three|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.003.shtml}}</ref> This disorganization of the center, combined with increasing wind shear and dry air suppressing convective activity, caused it to begin weakening later that morning.<ref name="disc4">{{cite web|author=Mainelli|year=2007|title=Subtropical Storm Andrea Discussion Four|publisher=National Hurricane Center|access-date=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.004.shtml}}</ref> By 1500&nbsp;UTC on May 10, only a few thunderstorms remained near the center, and thus the NHC downgraded Andrea to subtropical depression status.<ref name="disc5">{{cite web|author=Knabb|year=2007|title=Subtropical Depression Andrea Discussion Five|publisher=National Hurricane Center|access-date=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.005.shtml?}}</ref> Though a few intermittent thunderstorms persisted over the eastern semicircle, the depression remained disorganized and weak; the National Hurricane Center discontinued advisories early on May 11, after it had been without significant deep convection for 18&nbsp;hours about {{convert|80|mi|km}} northeast of [[Cape Canaveral, Florida]].<ref name="disc7">{{cite web|author=Rhome|publisher=National Hurricane Center|year=2007|title=Subtropical Depression Andrea Discussion Seven|access-date=2007-05-10|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.discus.007.shtml?}}</ref>


Later on May 11, convection re-fired over the center as the system drifted south-southeastward, though it lacked sufficient organization to qualify as a tropical cyclone.<ref name="may11stds">{{cite web|author=Knabb|year=2007|title=May 11 Special Tropical Disturbance Statement|accessdate=2007-05-11|publisher=National Hurricane Center|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705111856.txt}}</ref> By May 12, shower activity had organized greatly to the east of the center, and the National Hurricane Center remarked that a small increase in convection would result in the formation of a tropical depression.<ref name="stds512">{{cite web|author=Franklin|year=2007|title=May 12 Special Tropical Disturbance Statement|publisher=National Hurricane Center|accessdate=2007-05-13|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705130054.txt}}</ref> It accelerated east-northeastward away from the continental [[United States]] without redeveloping, and after passing over cooler waters,<ref name="stds513">{{cite web|author=Beven|year=2007|title=May 13 Special Tropical Disturbance Statement|publisher=National Hurricane Center|accessdate=2007-05-13|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705131400.txt}}</ref> the remnants of Andrea merged with an approaching [[cold front]] on May 14.<ref name="601two">{{cite web|author=National Hurricane Center|url=http://www.nhc.noaa.gov/archive/text/TWOAT/2007/TWOAT.200706010909.txt|title=June 1 Tropical Weather Outlook|accessdate=2007-06-01}}</ref>
Later on May 11, convection re-fired over the center as the system drifted south-southeastward, though it lacked sufficient organization to qualify as a tropical cyclone.<ref name="may11stds">{{cite web|author=Knabb|year=2007|title=May 11 Special Tropical Disturbance Statement|access-date=2007-05-11|publisher=National Hurricane Center|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705111856.txt}}</ref> By May 12, shower activity had organized greatly to the east of the center, and the National Hurricane Center remarked that a small increase in convection would result in the formation of a tropical depression.<ref name="stds512">{{cite web|author=Franklin|year=2007|title=May 12 Special Tropical Disturbance Statement|publisher=National Hurricane Center|access-date=2007-05-13|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705130054.txt}}</ref> It accelerated east-northeastward away from the continental [[United States]] without redeveloping, and after passing over cooler waters,<ref name="stds513">{{cite web|author=Beven|year=2007|title=May 13 Special Tropical Disturbance Statement|publisher=National Hurricane Center|access-date=2007-05-13|url=https://www.nhc.noaa.gov/archive/text/DSAAT/2007/DSAAT.200705131400.txt}}</ref> the remnants of Andrea merged with an approaching [[cold front]] on May 14.<ref name="601two">{{cite web|author=National Hurricane Center|url=http://www.nhc.noaa.gov/archive/text/TWOAT/2007/TWOAT.200706010909.txt|title=June 1 Tropical Weather Outlook|access-date=2007-06-01}}</ref>


== Preparations ==
== Preparations ==
Due to rough surf from the precursor low, local [[National Weather Service]] offices issued a High Surf Advisory for much of the coastline from Florida through North Carolina.<ref name="57twd" /> Upon first becoming a subtropical cyclone, the National Hurricane Center issued a [[tropical cyclone warnings and watches|tropical storm watch]] from the mouth of the [[Altamaha River]] in [[Georgia (U.S. state)|Georgia]] southward to [[Flagler Beach, Florida]].<ref name="adv1">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Public Advisory One|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.public.001.shtml?}}</ref> The watch was discontinued after Andrea weakened to a subtropical depression.<ref name="disc5" /> Additionally, a gale warning was issued for much of the [[South Carolina]] coastline.<ref name="WIStv">{{cite web|author=Jennifer Wilson|year=2007|title=Forecasters: Subtropical Storm Andrea has formed|publisher=WIStv Columbia, South Carolina|accessdate=2007-05-09|url=http://www.wistv.com/Global/story.asp?S=6488453&nav=menu36_2|archive-url=https://web.archive.org/web/20120207054739/http://www.wistv.com/Global/story.asp?S=6488453&nav=menu36_2|archive-date=2012-02-07|dead-url=yes|df=}}</ref>
Due to rough surf from the precursor low, local [[National Weather Service]] offices issued a High Surf Advisory for much of the coastline from Florida through North Carolina.<ref name="57twd" /> Upon first becoming a subtropical cyclone, the National Hurricane Center issued a [[tropical cyclone warnings and watches|tropical storm watch]] from the mouth of the [[Altamaha River]] in [[Georgia (U.S. state)|Georgia]] southward to [[Flagler Beach, Florida]].<ref name="adv1">{{cite web|author=Knabb|year=2007|title=Subtropical Storm Andrea Public Advisory One|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/2007/al01/al012007.public.001.shtml?}}</ref> The watch was discontinued after Andrea weakened to a subtropical depression.<ref name="disc5" /> Additionally, a gale warning was issued for much of the [[South Carolina]] coastline.<ref name="WIStv">{{cite web|author=Jennifer Wilson|year=2007|title=Forecasters: Subtropical Storm Andrea has formed|publisher=WIStv Columbia, South Carolina|access-date=2007-05-09|url=http://www.wistv.com/Global/story.asp?S=6488453&nav=menu36_2|archive-url=https://web.archive.org/web/20120207054739/http://www.wistv.com/Global/story.asp?S=6488453&nav=menu36_2|archive-date=2012-02-07|url-status=dead}}</ref>


At [[Isle of Palms, South Carolina|Isle of Palms]] in South Carolina, workers and dozens of firefighters prepared sandbags in preparation for high tide after waves from the storm previously caused moderate beach erosion. As a precaution, officials there intentionally cut power and gas to multiple uninhabited buildings.<ref name="WIStv" /> Officials closed schools in [[Dare County, North Carolina]] due to the threat for high winds from the storm. The [[North Carolina Department of Transportation]] also canceled ferry transportation to and from [[Ocracoke, North Carolina|Ocracoke]] and [[Knotts Island, North Carolina]].<ref name="vp599" />
At [[Isle of Palms, South Carolina|Isle of Palms]] in South Carolina, workers and dozens of firefighters prepared sandbags in preparation for high tide after waves from the storm previously caused moderate beach erosion. As a precaution, officials there intentionally cut power and gas to multiple uninhabited buildings.<ref name="WIStv" /> Officials closed schools in [[Dare County, North Carolina]] due to the threat for high winds from the storm. The [[North Carolina Department of Transportation]] also canceled ferry transportation to and from [[Ocracoke, North Carolina|Ocracoke]] and [[Knotts Island, North Carolina]].<ref name="vp599" />


== Impact ==
== Impact ==
[[File:Andrea-at-0705091615G12I01.jpg|right|thumb|Subtropical Storm Andrea shortly after being classified on May 9]]
[[File:Subtropical Storm Andrea (2007).JPG|right|thumb|Subtropical Storm Andrea shortly before being classified, on May 8]]
Prior to becoming a [[subtropical cyclone]], the low produced gale-force winds and dangerous surf near the coast from North Carolina through Georgia,<ref name="may8stds" /> and later along the coast of Florida.<ref name="may9stds" /> Significant swells were also reported in the [[Bahamas]].<ref name="58twd">{{cite web|author=Willis|year=2007|title=May 8 Tropical Weather Discussion|publisher=National Hurricane Center|accessdate=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705081046.txt}}</ref> The waves caused beach erosion and washed up against coastal houses along the southeast coast of the United States.<ref name="ap59">{{cite news|author=Jessica Gresko|year=2007|title=Year's first named storm becomes Andrea, forms 3 weeks before hurricane season begins|agency=Associated Press}}</ref>
Prior to becoming a [[subtropical cyclone]], the low produced gale-force winds and dangerous surf near the coast from North Carolina through Georgia,<ref name="may8stds" /> and later along the coast of Florida.<ref name="may9stds" /> Significant swells were also reported in the [[Bahamas]].<ref name="58twd">{{cite web|author=Willis|year=2007|title=May 8 Tropical Weather Discussion|publisher=National Hurricane Center|access-date=2007-05-09|url=http://www.nhc.noaa.gov/archive/text/TWDAT/2007/TWDAT.200705081046.txt}}</ref> The waves caused beach erosion and washed up against coastal houses along the southeast coast of the United States.<ref name="ap59">{{cite news|author=Jessica Gresko|year=2007|title=Year's first named storm becomes Andrea, forms 3 weeks before hurricane season begins|agency=Associated Press}}</ref>


=== Southeastern U.S. ===
=== Southeastern U.S. ===
Off the coast of North Carolina, the storm produced 34-foot (10-m) waves and storm force winds which damaged three boats; their combined nine passengers were rescued by the [[United States Coast Guard|Coast Guard]]. All nine were injured to some degree; three endured hypothermia, one received a broken rib, and one Coast Guardsman experienced back injuries from the surf.<ref name="vp58">{{cite news|work=Virginian Pilot|date=2007-05-08|title=High drama on high seas}}</ref> Another boat and its four occupants were reported missing,<ref name="vp599">{{cite news|author1=Lauren King|author2=Kristin Davis|lastauthoramp=yes|date=2007-05-10|title=Season's first named storm unleashes band of rain|work=Virginian Pilot|url=http://hamptonroads.com/node/263421|accessdate=2007-05-09}}</ref><ref name="whdh">{{cite web|publisher=Sunbeam Television|year=2007|title=Coast Guard continues search for missing sailors|accessdate=2007-05-10|url=http://www3.whdh.com/news/articles/local/BO51728|deadurl=yes|archiveurl=https://web.archive.org/web/20070513023200/http://www3.whdh.com/news/articles/local/BO51728/|archivedate=2007-05-13|df=}}</ref> and after twelve days they remain missing.<ref>{{cite web|author=Amanda Milkovits|year=2007|title=Sailors' circle holds hope|work=The Providence Journal|accessdate=2007-05-18|url=http://www.projo.com/news/content/a_sailors_life_05-18-07_UB5M866.355c273.html}}</ref> Rough waves from the precursor low left two kayakers missing near [[Seabrook Island, South Carolina]]. One was found the next day,<ref name="ap59stuff">{{cite web|agency=Associated Press|year=2007|title=First named '07 Atlantic storm forms near coast|accessdate=2007-05-09|url=http://www.msnbc.msn.com/id/18573390/}}</ref> and the other was found dead a week later.<ref name="ap524">{{cite news|agency=Associated Press|date=2007-05-24|title=DNA identifies missing Atlanta kayaker's body in S.C.|url=https://www.accessnorthga.com/detail.php?n=97279|accessdate=2007-05-26|deadurl=yes|archiveurl=https://web.archive.org/web/20140523094939/https://www.accessnorthga.com/detail.php?n=97279|archivedate=2014-05-23|df=}}</ref>
Off the coast of North Carolina, the storm produced 34-foot (10-m) waves and storm force winds which damaged three boats; their combined nine passengers were rescued by the [[United States Coast Guard|Coast Guard]]. All nine were injured to some degree; three endured hypothermia, one received a broken rib, and one Coast Guardsman experienced back injuries from the surf.<ref name="vp58">{{cite news|work=Virginian Pilot|date=2007-05-08|title=High drama on high seas}}</ref> Another boat and its four occupants were reported missing,<ref name="vp599">{{cite news|author1=Lauren King|author2=Kristin Davis|name-list-style=amp|date=2007-05-10|title=Season's first named storm unleashes band of rain|work=Virginian Pilot|url=http://hamptonroads.com/node/263421|access-date=2007-05-09}}</ref><ref name="whdh">{{cite web|publisher=Sunbeam Television|year=2007|title=Coast Guard continues search for missing sailors|access-date=2007-05-10|url=http://www3.whdh.com/news/articles/local/BO51728|url-status=dead|archive-url=https://web.archive.org/web/20070513023200/http://www3.whdh.com/news/articles/local/BO51728/|archive-date=2007-05-13}}</ref> and after twelve days they remain missing.<ref>{{cite web|author=Amanda Milkovits|year=2007|title=Sailors' circle holds hope|work=The Providence Journal|access-date=2007-05-18|url=http://www.projo.com/news/content/a_sailors_life_05-18-07_UB5M866.355c273.html}}</ref> Rough waves from the precursor low left two kayakers missing near [[Seabrook Island, South Carolina]]. One was found the next day,<ref name="ap59stuff">{{cite web|agency=Associated Press|year=2007|title=First named '07 Atlantic storm forms near coast|website=[[NBC News]] |access-date=2007-05-09|url=https://www.nbcnews.com/id/wbna18573390}}</ref> and the other was found dead a week later.<ref name="ap524">{{cite news|agency=Associated Press|date=2007-05-24|title=DNA identifies missing Atlanta kayaker's body in S.C.|url=https://www.accessnorthga.com/detail.php?n=97279|access-date=2007-05-26|url-status=dead|archive-url=https://web.archive.org/web/20140523094939/https://www.accessnorthga.com/detail.php?n=97279|archive-date=2014-05-23}}</ref>


Onshore, winds reached 52&nbsp;mph (84&nbsp;km/h) in [[Norfolk, Virginia]], with an unofficial report of 57&nbsp;mph (92&nbsp;km/h) near [[Virginia Beach, Virginia|Virginia Beach]]. Similar observations occurred along the [[Outer Banks]],<ref name="vp57">{{cite news|author=Steve Stone|work=Virginian Pilot|date=2007-05-07|title=Wind and chill chase away spring today's weather|url=http://www.highbeam.com/doc/1G1-163074166.html|archive-url=https://web.archive.org/web/20150402111831/http://www.highbeam.com/doc/1G1-163074166.html|dead-url=yes|archive-date=2015-04-02|accessdate=2007-05-09}}</ref> with the winds knocking some tree limbs onto power lines;<ref name="sj58">{{cite web|author=Francine Sawyer|work=New Bern Sun Journal|accessdate=2007-05-09|year=2007|title=Storm moving away from coast|url=http://ww.newbernsj.com/news/weather_34221___article.html/service_winds.html|archiveurl=https://web.archive.org/web/20070929001915/http://www.newbernsj.com/news/weather_34221___article.html/service_winds.html|archivedate=2007-09-29|dead-url=yes|df=}}</ref> some isolated power outages were reported.<ref name="vp599" /> Wind damage included some roofs losing shingles from the winds.<ref name="vp57" /> In [[Elizabeth City, North Carolina]], an outer [[tropical cyclone#Physical structure|rainband]] dropped 0.5&nbsp;inches (10&nbsp;mm) of precipitation in about two&nbsp;hours as well as several lightning strikes; one bolt of lightning injured two firefighters.<ref name="vp599" /> The winds covered portions of [[North Carolina Highway 12]] with sand,<ref name="vp57" /> and for a day the route was closed after waves from the storm washed out about 200&nbsp;feet (60&nbsp;m) of roadway.<ref name="vp599" /> In some locations, the waves eroded up to 20&nbsp;feet (6&nbsp;m) of beach, leaving 70&nbsp;homes in imminent danger.<ref name="wral">{{cite web|author=Bryan Mims|publisher=WRAL.com|year=2007|accessdate=2007-05-09|title=Offshore Storm System Raked N.C. Beaches|url=http://www.wral.com/weather/story/1399195/}}</ref> On [[St. Simons, Georgia|St. Simons Island]] in Georgia, the storm produced a [[storm tide]] of 8.09&nbsp;feet (2.43&nbsp;m). Trace amounts of rainfall occurred in the southeastern portion of the state.<ref name="jacknws" />
Onshore, winds reached {{convert|52|mph|km/h|abbr=on}} in [[Norfolk, Virginia]], with an unofficial report of {{convert|57|mph|km/h|abbr=on}} near [[Virginia Beach, Virginia|Virginia Beach]]. Similar observations occurred along the [[Outer Banks]],<ref name="vp57">{{cite news|author=Steve Stone|work=Virginian Pilot|date=2007-05-07|title=Wind and chill chase away spring today's weather|url=http://www.highbeam.com/doc/1G1-163074166.html|archive-url=https://web.archive.org/web/20150402111831/http://www.highbeam.com/doc/1G1-163074166.html|url-status=dead|archive-date=2015-04-02|access-date=2007-05-09}}</ref> with the winds knocking some tree limbs onto power lines;<ref name="sj58">{{cite web|author=Francine Sawyer|work=New Bern Sun Journal|access-date=2007-05-09|year=2007|title=Storm moving away from coast|url=http://ww.newbernsj.com/news/weather_34221___article.html/service_winds.html|archive-url=https://web.archive.org/web/20070929001915/http://www.newbernsj.com/news/weather_34221___article.html/service_winds.html|archive-date=2007-09-29|url-status=dead}}</ref> some isolated power outages were reported.<ref name="vp599" /> Wind damage included some roofs losing shingles from the winds.<ref name="vp57" /> In [[Elizabeth City, North Carolina]], an outer [[rainband]] dropped {{convert|0.5|in|mm}} of precipitation in about two&nbsp;hours as well as several lightning strikes; one bolt of lightning injured two firefighters.<ref name="vp599" /> The winds covered portions of [[North Carolina Highway 12]] with sand,<ref name="vp57" /> and for a day the route was closed after waves from the storm washed out about {{convert|200|ft|m}} of roadway.<ref name="vp599" /> In some locations, the waves eroded up to {{convert|20|ft|m}} of beach, leaving 70&nbsp;homes in imminent danger.<ref name="wral">{{cite web|author=Bryan Mims|publisher=WRAL.com|year=2007|access-date=2007-05-09|title=Offshore Storm System Raked N.C. Beaches|url=http://www.wral.com/weather/story/1399195/}}</ref> On [[St. Simons, Georgia|St. Simons Island]] in Georgia, the storm produced a [[storm tide]] of {{convert|8.09|ft|m}}. Trace amounts of rainfall occurred in the southeastern portion of the state.<ref name="jacknws" />


=== Florida ===
=== Florida ===
In Florida, waves of over 10&nbsp;feet (3&nbsp;m) in height capsized a boat near [[Lantana, Florida|Lantana]]; the two occupants were rescued without injury. Additionally, the waves displaced a sailboat that had previously been washed ashore in [[Juno Beach, Florida|Juno Beach]]. Large waves flooded a parking lot and destroyed several fences and tree branches at [[Jupiter, Florida|Jupiter Beach]], which resulted in its temporary closure; nearby a maintenance shed was destroyed. Eight [[leatherback sea turtle]] nests in [[Boca Raton, Florida|Boca Raton]] were destroyed after the surf reached the dunes.<ref name="sfs59">{{cite news|author1=Erika Pesantes, Sally Apgar|author2=Chrystian Tejedor|lastauthoramp=yes|date=2007-05-09|title=Sweeping erosion hits Palm Beach County coast: Low-pressure system sucks swaths of sand; Jupiter feels brunt of it|work=South Florida Sun-Sentinel|url=http://articles.sun-sentinel.com/2007-05-09/news/0705090095_1_beach-erosion-sand-dunes-palm-beach-county|accessdate=2007-05-09}}</ref> Due to high surf, the beach pier at [[Flagler Beach, Florida|Flagler Beach]] was closed for about a day. Minor to moderate beach erosion caused the Florida Department of Transportation to fill in areas near the seawall with sand.<ref name="jacknws" /> One death occurred when a surfer drowned in the rough waves off the coast at [[New Smyrna Beach, Florida|New Smyrna Beach]] in [[Volusia County, Florida|Volusia County]].<ref name="Orlando Sentinel">{{cite news|author=Tanya Caldwell|year=2007|title=Holly Hill surfer drowns after taking on 'gigantic wave' in New Smyrna Beach|work=[[Orlando Sentinel]]}}</ref> Outer rainbands produced light rainfall, with the highest report in the [[Jacksonville, Florida|Jacksonville]] National Weather Service area of responsibility totaling 0.77&nbsp;inches (20&nbsp;mm); the bands also caused tropical storm force wind gusts in the northeastern portion of the state.<ref name="jacknws">{{cite web|author=Keegan, Shashy, McAllister, & Enyedi|year=2007|title=Post-Tropical Cyclone Report|publisher=Jacksonville, Florida National Weather Service|accessdate=2007-05-19|url=http://www.srh.weather.gov/jax/text.php?sid=JAX|deadurl=yes|archiveurl=https://www.webcitation.org/5Oy3NRnN6?url=http://www.srh.weather.gov/jax/text.php?sid=JAX&pil=PSH|archivedate=2007-05-20|df=}}</ref> The winds spread smoke from local [[wildfire|brush fires]] through the [[Tampa Bay]] area to [[Miami, Florida|Miami]].<ref name="bradenton">{{cite news|year=2007|title=Subtropical storm Andrea is swirling off the north Florida coastline|work=Bradenton Herald}}</ref><ref name="Wildfires">{{cite news|publisher=CNN|year=2007|title=Atlantic's first named storm whips up wildfires|accessdate=2007-05-10|url=http://www.cnn.com/2007/WEATHER/05/09/storm.andrea/index.html}}</ref> High winds from Andrea were reported as fueling [[Bugaboo scrub fire|severe wildfires]] in northern Florida and southern Georgia.<ref name="lifetime">{{cite news|title='Fire of a lifetime' hits North Florida|url=http://articles.orlandosentinel.com/2007-05-12/news/FIRE12_1_florida-division-florida-fire-north-florida|accessdate=2007-05-13|date=2007-05-12|author1=Kevin Spear|author2=Jim Stratton|lastauthoramp=yes|work=Orlando Sentinel}}</ref>
In Florida, waves of over {{convert|10|ft|m}} in height capsized a boat near [[Lantana, Florida|Lantana]]; the two occupants were rescued without injury. Additionally, the waves displaced a sailboat that had previously been washed ashore in [[Juno Beach, Florida|Juno Beach]]. Large waves flooded a parking lot and destroyed several fences and tree branches at [[Jupiter, Florida|Jupiter Beach]], which resulted in its temporary closure; nearby a maintenance shed was destroyed. Eight [[leatherback sea turtle]] nests in [[Boca Raton, Florida|Boca Raton]] were destroyed after the surf reached the dunes.<ref name="sfs59">{{cite news|author1=Erika Pesantes, Sally Apgar|author2=Chrystian Tejedor|name-list-style=amp|date=2007-05-09|title=Sweeping erosion hits Palm Beach County coast: Low-pressure system sucks swaths of sand; Jupiter feels brunt of it|work=South Florida Sun-Sentinel|url=http://articles.sun-sentinel.com/2007-05-09/news/0705090095_1_beach-erosion-sand-dunes-palm-beach-county|archive-url=https://archive.today/20150228110336/http://articles.sun-sentinel.com/2007-05-09/news/0705090095_1_beach-erosion-sand-dunes-palm-beach-county|url-status=dead|archive-date=February 28, 2015|access-date=2007-05-09}}</ref> Due to high surf, the beach pier at [[Flagler Beach, Florida|Flagler Beach]] was closed for about a day. Minor to moderate beach erosion caused the Florida Department of Transportation to fill in areas near the seawall with sand.<ref name="jacknws" /> One death occurred when a surfer drowned in the rough waves off the coast at [[New Smyrna Beach, Florida|New Smyrna Beach]] in [[Volusia County, Florida|Volusia County]].<ref name="Orlando Sentinel">{{cite news|author=Tanya Caldwell|year=2007|title=Holly Hill surfer drowns after taking on 'gigantic wave' in New Smyrna Beach|work=[[Orlando Sentinel]]}}</ref> Outer rainbands produced light rainfall, with the highest report in the [[Jacksonville, Florida|Jacksonville]] National Weather Service area of responsibility totaling {{convert|0.77|in|mm}}; the bands also caused tropical storm force wind gusts in the northeastern portion of the state.<ref name="jacknws">{{cite web|author=Keegan, Shashy, McAllister, & Enyedi|year=2007|title=Post-Tropical Cyclone Report|publisher=Jacksonville, Florida National Weather Service|access-date=2007-05-19|url=http://www.srh.weather.gov/jax/text.php?sid=JAX|url-status=dead|archive-url=https://web.archive.org/web/20070815093122/http://www.srh.weather.gov/jax/text.php?sid=JAX&pil=PSH|archive-date=2007-08-15}}</ref> The winds spread smoke from local [[wildfire|brush fires]] through the [[Tampa Bay]] area to [[Miami, Florida|Miami]].<ref name="bradenton">{{cite news|year=2007|title=Subtropical storm Andrea is swirling off the north Florida coastline|work=Bradenton Herald}}</ref><ref name="Wildfires">{{cite news|publisher=CNN|year=2007|title=Atlantic's first named storm whips up wildfires|access-date=2007-05-10|url=http://www.cnn.com/2007/WEATHER/05/09/storm.andrea/index.html}}</ref> High winds from Andrea were reported as fueling [[Bugaboo Scrub fire|severe wildfires]] in northern Florida and southern Georgia.<ref name="lifetime">{{cite news|title='Fire of a lifetime' hits North Florida|url=https://www.orlandosentinel.com/2007/05/12/fire-of-a-lifetime-hits-north-florida/|access-date=2007-05-13|date=2007-05-12|author1=Kevin Spear|author2=Jim Stratton|name-list-style=amp|work=Orlando Sentinel}}</ref>


== See also ==
== See also ==
{{Portal|Tropical cyclones}}
{{Portal|Tropical cyclones|United States}}
* [[Hurricane Andrea (disambiguation)|Other storms of the same name]]
* [[Tropical Storm Andrea|Other storms of the same name]]
* [[List of Florida hurricanes]]
* [[List of Florida hurricanes]]
* [[List of North Carolina hurricanes]]
* [[List of North Carolina hurricanes]]
Line 81: Line 83:
[[Category:Hurricanes in the Bahamas]]
[[Category:Hurricanes in the Bahamas]]
[[Category:2007 natural disasters in the United States|Subtropical Storm Andrea]]
[[Category:2007 natural disasters in the United States|Subtropical Storm Andrea]]
[[Category:Tropical cyclones in 2007|Andrea]]

Latest revision as of 05:41, 24 September 2024

Subtropical Storm Andrea
Andrea shortly after being classified as a subtropical storm, on May 9
Meteorological history
FormedMay 9, 2007
ExtratropicalMay 11, 2007
DissipatedMay 14, 2007
Subtropical storm
1-minute sustained (SSHWS/NWS)
Highest winds60 mph (95 km/h)
Lowest pressure1001 mbar (hPa); 29.56 inHg
Overall effects
Fatalities6 indirect
DamageMinimal
Areas affectedVirginia, Southeastern U.S., Bahamas
IBTrACSEdit this at Wikidata
Part of the 2007 Atlantic hurricane season

Subtropical Storm Andrea was the first named storm to form in May in the Atlantic Ocean in 26 years. Andrea caused large waves and tropical-storm force winds along the southeast coast of the United States. The first named storm and the first subtropical cyclone of the 2007 Atlantic hurricane season, Andrea developed out of a non-tropical low on May 9 about 150 miles (240 km) northeast of Daytona Beach, Florida, three weeks before the official start of the season. After encountering dry air and strong vertical wind shear, Andrea weakened to a subtropical depression on May 10 while remaining nearly stationary, and the National Hurricane Center discontinued advisories early on May 11. Andrea's remnant was subsequently absorbed into another extratropical storm on May 14. Andrea was the first pre-season storm to develop since Tropical Storm Ana in April 2003. Additionally, the storm was the first Atlantic named storm in May since Tropical Storm Arlene in 1981.[1]

The storm produced rough surf along the coastline from Florida to North Carolina, causing beach erosion and some damage. In some areas, the waves eroded up to 20 feet (6.1 m) of beach, leaving 70 homes in danger of collapse. Offshore North Carolina, high waves of 34 feet (10 m) and tropical-storm-force winds damaged three boats; their combined nine passengers were rescued by the Coast Guard, although all nine sustained injuries. Light rainfall was also reported in some coastal locations. Damage was minimal, but six people drowned as a result of the storm.

Meteorological history

[edit]
Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

In early May, an upper-level trough dropped southward through the western Atlantic Ocean, forcing a back-door cold front—a cold front that moves southwestward ahead of a building surface ridge to its north or northeast—southward. For several days, forecast models had anticipated for the trough to evolve into a closed low pressure area,[2] and on May 6, a frontal low with a large and well-defined circulation developed about 90 miles (140 km) east of Cape Hatteras. The low maintained scattered convection around its circulation center, and in conjunction with the strong high pressure to its north, a very tight pressure gradient produced gale-force winds near the coastline.[3] The extratropical storm tracked southeastward and later turned to the southwest while steadily deepening; on May 7, it attained hurricane-force winds.[4] On the same day, the storm reached its extratropical peak, with a minimum central pressure of 988 millibars (29.2 inHg).[4] With a lack of tropical moisture, the storm's corresponding convection was minimal and scattered.[5]

The National Hurricane Center first mentioned the possibility of tropical cyclogenesis on May 8, while the storm was located about 230 miles (370 km) east-southeast of the South Carolina coastline. Its associated convection had steadily increased as it tracked slowly westward at 5–10 mph (8.0–16.1 km/h).[6] The system changed little in organization throughout the day,[7] though by the following morning, hurricane specialists indicated the low was acquiring subtropical characteristics[8] as it tracked over progressively warmer waters.[4] Early on May 9, a Hurricane Hunters flight into the system revealed winds of 45 mph (72 km/h) and a flat thermal core, which indicated the system was neither warm-core nor cold-core. In addition, satellite imagery indicated a consolidation of the convection near the center, as well as hints of upper-level outflow and a contraction of the radius of maximum winds from more than 115 miles (185 km) to about 70 miles (110 km). Based on the observations and the hybrid structure of the system, the National Hurricane Center classified the low as Subtropical Storm Andrea at 1500 UTC on May 9 about 150 miles (240 km) northeast of Daytona Beach, Florida.[9] During a subsequent analysis of the storm, researchers estimated that the storm had transitioned into a subtropical cyclone nine hours earlier.[4] As Andrea developed before June 1—the traditional start of hurricane seasons in the Atlantic Ocean—it became the first pre-season storm since Tropical Storm Ana in April 2003. Additionally, the storm was the first Atlantic named storm in May since Tropical Storm Arlene in 1981.[1]

A satellite animation of the formation of Subtropical Storm Andrea, as seen in water-vapor imagery

Upon first becoming a subtropical cyclone, Andrea was embedded within a large, nearly stationary deep-layer trough, resulting in a westward movement. Drifting over sea surface temperatures of no more than 77 ° F (25 °C),[9] the organization of the system deteriorated with a significant decrease in convection.[10] By early on May 10, much of the associated weather was located to the east of the cyclone within a band of moderate convection due to a brief spell of westerly vertical wind shear. The center of circulation had become disorganized, with several small cloud swirls within the larger circulation.[11] This disorganization of the center, combined with increasing wind shear and dry air suppressing convective activity, caused it to begin weakening later that morning.[12] By 1500 UTC on May 10, only a few thunderstorms remained near the center, and thus the NHC downgraded Andrea to subtropical depression status.[13] Though a few intermittent thunderstorms persisted over the eastern semicircle, the depression remained disorganized and weak; the National Hurricane Center discontinued advisories early on May 11, after it had been without significant deep convection for 18 hours about 80 miles (130 km) northeast of Cape Canaveral, Florida.[14]

Later on May 11, convection re-fired over the center as the system drifted south-southeastward, though it lacked sufficient organization to qualify as a tropical cyclone.[15] By May 12, shower activity had organized greatly to the east of the center, and the National Hurricane Center remarked that a small increase in convection would result in the formation of a tropical depression.[16] It accelerated east-northeastward away from the continental United States without redeveloping, and after passing over cooler waters,[17] the remnants of Andrea merged with an approaching cold front on May 14.[18]

Preparations

[edit]

Due to rough surf from the precursor low, local National Weather Service offices issued a High Surf Advisory for much of the coastline from Florida through North Carolina.[3] Upon first becoming a subtropical cyclone, the National Hurricane Center issued a tropical storm watch from the mouth of the Altamaha River in Georgia southward to Flagler Beach, Florida.[19] The watch was discontinued after Andrea weakened to a subtropical depression.[13] Additionally, a gale warning was issued for much of the South Carolina coastline.[20]

At Isle of Palms in South Carolina, workers and dozens of firefighters prepared sandbags in preparation for high tide after waves from the storm previously caused moderate beach erosion. As a precaution, officials there intentionally cut power and gas to multiple uninhabited buildings.[20] Officials closed schools in Dare County, North Carolina due to the threat for high winds from the storm. The North Carolina Department of Transportation also canceled ferry transportation to and from Ocracoke and Knotts Island, North Carolina.[21]

Impact

[edit]
Subtropical Storm Andrea shortly before being classified, on May 8

Prior to becoming a subtropical cyclone, the low produced gale-force winds and dangerous surf near the coast from North Carolina through Georgia,[6] and later along the coast of Florida.[7] Significant swells were also reported in the Bahamas.[22] The waves caused beach erosion and washed up against coastal houses along the southeast coast of the United States.[23]

Southeastern U.S.

[edit]

Off the coast of North Carolina, the storm produced 34-foot (10-m) waves and storm force winds which damaged three boats; their combined nine passengers were rescued by the Coast Guard. All nine were injured to some degree; three endured hypothermia, one received a broken rib, and one Coast Guardsman experienced back injuries from the surf.[24] Another boat and its four occupants were reported missing,[21][25] and after twelve days they remain missing.[26] Rough waves from the precursor low left two kayakers missing near Seabrook Island, South Carolina. One was found the next day,[27] and the other was found dead a week later.[28]

Onshore, winds reached 52 mph (84 km/h) in Norfolk, Virginia, with an unofficial report of 57 mph (92 km/h) near Virginia Beach. Similar observations occurred along the Outer Banks,[29] with the winds knocking some tree limbs onto power lines;[30] some isolated power outages were reported.[21] Wind damage included some roofs losing shingles from the winds.[29] In Elizabeth City, North Carolina, an outer rainband dropped 0.5 inches (13 mm) of precipitation in about two hours as well as several lightning strikes; one bolt of lightning injured two firefighters.[21] The winds covered portions of North Carolina Highway 12 with sand,[29] and for a day the route was closed after waves from the storm washed out about 200 feet (61 m) of roadway.[21] In some locations, the waves eroded up to 20 feet (6.1 m) of beach, leaving 70 homes in imminent danger.[31] On St. Simons Island in Georgia, the storm produced a storm tide of 8.09 feet (2.47 m). Trace amounts of rainfall occurred in the southeastern portion of the state.[32]

Florida

[edit]

In Florida, waves of over 10 feet (3.0 m) in height capsized a boat near Lantana; the two occupants were rescued without injury. Additionally, the waves displaced a sailboat that had previously been washed ashore in Juno Beach. Large waves flooded a parking lot and destroyed several fences and tree branches at Jupiter Beach, which resulted in its temporary closure; nearby a maintenance shed was destroyed. Eight leatherback sea turtle nests in Boca Raton were destroyed after the surf reached the dunes.[33] Due to high surf, the beach pier at Flagler Beach was closed for about a day. Minor to moderate beach erosion caused the Florida Department of Transportation to fill in areas near the seawall with sand.[32] One death occurred when a surfer drowned in the rough waves off the coast at New Smyrna Beach in Volusia County.[34] Outer rainbands produced light rainfall, with the highest report in the Jacksonville National Weather Service area of responsibility totaling 0.77 inches (20 mm); the bands also caused tropical storm force wind gusts in the northeastern portion of the state.[32] The winds spread smoke from local brush fires through the Tampa Bay area to Miami.[35][36] High winds from Andrea were reported as fueling severe wildfires in northern Florida and southern Georgia.[37]

See also

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References

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  1. ^ a b "Atlantic hurricane best track (HURDAT version 2)" (Database). United States National Hurricane Center. April 5, 2023. Retrieved January 1, 2025. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ Cangialosi (2007). "May 4 Tropical Weather Discussion". National Hurricane Center. Archived from the original on 2017-05-07. Retrieved 2007-05-09.
  3. ^ a b Cangialosi (2007). "May 6 Tropical Weather Discussion". National Hurricane Center. Retrieved 2007-05-09.
  4. ^ a b c d Jamie R. Rhome; Jack Beven & Mark Willis (2007). "Subtropical Storm Andrea Tropical Cyclone Report" (PDF). National Hurricane Center. Retrieved 2007-07-02.
  5. ^ Cangialosi (2007). "May 7 Tropical Weather Discussion". National Hurricane Center. Retrieved 2007-05-09.
  6. ^ a b Knabb (2007). "May 8 Special Tropical Disturbance Statement". National Hurricane Center. Retrieved 2007-05-09.
  7. ^ a b Brown (2007). "May 9 Special Tropical Disturbance Statement". National Hurricane Center. Retrieved 2007-05-09.
  8. ^ Franklin/Knabb (2007). "May 9 Special Tropical Disturbance Statement (2)". National Hurricane Center. Retrieved 2007-05-09.
  9. ^ a b Knabb (2007). "Subtropical Storm Andrea Discussion One". National Hurricane Center. Retrieved 2007-05-09.
  10. ^ Knabb (2007). "Subtropical Storm Andrea Discussion Two". National Hurricane Center. Retrieved 2007-05-09.
  11. ^ Avila (2007). "Subtropical Storm Andrea Discussion Three". National Hurricane Center. Retrieved 2007-05-09.
  12. ^ Mainelli (2007). "Subtropical Storm Andrea Discussion Four". National Hurricane Center. Retrieved 2007-05-10.
  13. ^ a b Knabb (2007). "Subtropical Depression Andrea Discussion Five". National Hurricane Center. Retrieved 2007-05-10.
  14. ^ Rhome (2007). "Subtropical Depression Andrea Discussion Seven". National Hurricane Center. Retrieved 2007-05-10.
  15. ^ Knabb (2007). "May 11 Special Tropical Disturbance Statement". National Hurricane Center. Retrieved 2007-05-11.
  16. ^ Franklin (2007). "May 12 Special Tropical Disturbance Statement". National Hurricane Center. Retrieved 2007-05-13.
  17. ^ Beven (2007). "May 13 Special Tropical Disturbance Statement". National Hurricane Center. Retrieved 2007-05-13.
  18. ^ National Hurricane Center. "June 1 Tropical Weather Outlook". Retrieved 2007-06-01.
  19. ^ Knabb (2007). "Subtropical Storm Andrea Public Advisory One". National Hurricane Center. Retrieved 2007-05-09.
  20. ^ a b Jennifer Wilson (2007). "Forecasters: Subtropical Storm Andrea has formed". WIStv Columbia, South Carolina. Archived from the original on 2012-02-07. Retrieved 2007-05-09.
  21. ^ a b c d e Lauren King & Kristin Davis (2007-05-10). "Season's first named storm unleashes band of rain". Virginian Pilot. Retrieved 2007-05-09.
  22. ^ Willis (2007). "May 8 Tropical Weather Discussion". National Hurricane Center. Retrieved 2007-05-09.
  23. ^ Jessica Gresko (2007). "Year's first named storm becomes Andrea, forms 3 weeks before hurricane season begins". Associated Press.
  24. ^ "High drama on high seas". Virginian Pilot. 2007-05-08.
  25. ^ "Coast Guard continues search for missing sailors". Sunbeam Television. 2007. Archived from the original on 2007-05-13. Retrieved 2007-05-10.
  26. ^ Amanda Milkovits (2007). "Sailors' circle holds hope". The Providence Journal. Retrieved 2007-05-18.
  27. ^ "First named '07 Atlantic storm forms near coast". NBC News. Associated Press. 2007. Retrieved 2007-05-09.
  28. ^ "DNA identifies missing Atlanta kayaker's body in S.C." Associated Press. 2007-05-24. Archived from the original on 2014-05-23. Retrieved 2007-05-26.
  29. ^ a b c Steve Stone (2007-05-07). "Wind and chill chase away spring today's weather". Virginian Pilot. Archived from the original on 2015-04-02. Retrieved 2007-05-09.
  30. ^ Francine Sawyer (2007). "Storm moving away from coast". New Bern Sun Journal. Archived from the original on 2007-09-29. Retrieved 2007-05-09.
  31. ^ Bryan Mims (2007). "Offshore Storm System Raked N.C. Beaches". WRAL.com. Retrieved 2007-05-09.
  32. ^ a b c Keegan, Shashy, McAllister, & Enyedi (2007). "Post-Tropical Cyclone Report". Jacksonville, Florida National Weather Service. Archived from the original on 2007-08-15. Retrieved 2007-05-19.{{cite web}}: CS1 maint: multiple names: authors list (link)
  33. ^ Erika Pesantes, Sally Apgar & Chrystian Tejedor (2007-05-09). "Sweeping erosion hits Palm Beach County coast: Low-pressure system sucks swaths of sand; Jupiter feels brunt of it". South Florida Sun-Sentinel. Archived from the original on February 28, 2015. Retrieved 2007-05-09.
  34. ^ Tanya Caldwell (2007). "Holly Hill surfer drowns after taking on 'gigantic wave' in New Smyrna Beach". Orlando Sentinel.
  35. ^ "Subtropical storm Andrea is swirling off the north Florida coastline". Bradenton Herald. 2007.
  36. ^ "Atlantic's first named storm whips up wildfires". CNN. 2007. Retrieved 2007-05-10.
  37. ^ Kevin Spear & Jim Stratton (2007-05-12). "'Fire of a lifetime' hits North Florida". Orlando Sentinel. Retrieved 2007-05-13.
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