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User:Sria-72/Southeastern Pacific tropical cyclone

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Within the extreme southeastern sector of the Pacific Ocean, tropical cyclogenesis is extremely rare due to cold sea surface temperatures. However, in a select few occasions, storms have developed in this area. Only two have recorded reaching tropical cyclone status, both of which also became severe tropical cyclones.

Storms

Pre-2015

Unnumbered Tropical Cyclone

Category 1 tropical cyclone (SSHWS)
 
DurationMay 13, 1983 – May 14, 1983
Peak intensity120 km/h (75 mph) (1-min);

Cyclone Hinano

Category 3 severe tropical cyclone (Australian scale)
Category 2 tropical cyclone (SSHWS)
 
DurationFebruary 21 – March 1
Peak intensity150 km/h (90 mph) (10-min);
970 hPa (mbar)

The tropical disturbance that eventually formed Severe Tropical Cyclone Hinano was first noted on February 19, by the United States Synoptic Analysis Branch (USSAB). At this time, it was located approximately 630 km (390 mi) to the northwest of Adamstown which is located in the Pitcairn Islands.[1] The system then drifted south-westwards and was designated as a weak tropical depression by the Tahiti Meteorological office during February 21.[1][2]

Hinano eventually moved back into the eastern sector of the South Pacific basin proper while peaking as a category 2-equivalent tropical cyclone on the Saffir–Simpson hurricane wind scale, and dissipated afterwards.

2015-present

Subtropical Cyclone Katie

Subtropical storm
 
DurationApril 29, 2015 – May 4, 2015
Peak intensity75 km/h (45 mph) (1-min);
993 hPa (mbar)
Main article: Subtropical Cyclone Katie

On April 29, 2015, close to the end of the 2014–15 South Pacific cyclone season, an extratropical cyclone developed in the far Southeastern Pacific, before transitioning into a subtropical depression relatively soon afterward.[3] The storm transitioned into a subtropical depression at 102.9°W, out of the South Pacific basin's eastern boundary of 120°W.[3][4] Around this time, the Chilean Navy Weather Service included the storm in their High Seas Warnings, which kept it there until May 4.[5] During the next couple days, the system moved southwestwards, before turning to the southeast. On May 1, the storm intensified into to subtropical storm intensity, and executed a small westward loop.[3] During this time, the system had encountered sea surface temperatures about 1 °C (1.8 °F) above average and low wind shear, due to an extremely strong El Niño event, allowing the storm to further intensify and organize.[6] On May 2, the storm reached its likely peak intensity, with maximum sustained winds of 72 km/h (45 mph; 39 kn),[3][nb 1] and a minimum low pressure of 993 hPa (29.32 inHg).[5] Around this time, the storm was unofficially named Katie.[6] Katie then tracked westwards, slowly weakening. On May 4, Katie weakened into a subtropical depression and began moving quicker to the northwest, passing to the east of Easter Island, before degenerating into a remnant low.[3][5] On May 6, Katie's remnant low dissipated.[5] During Katie's entire existence, the storm remained east of 120°W, which is not within the official recognized boundary of the basin.[3][5]

Subtropical Cyclone Lexi

Subtropical storm
 
DurationMay 4 2018 – May 9, 2018
Peak intensity85 km/h (50 mph) (1-min);
992 hPa (mbar)

Subtropical Cyclone Humberto

Subtropical storm
 
DurationJanuary 12, 2022 – January 14, 2022
Peak intensity120 km/h (75 mph) (1-min);
1000 hPa (mbar)
  1. ^ a b Ruminski, Mark (January 1991). "Picture of the Month: Two Unusual Tropical Cyclones in the South Pacific". Monthly Weather Review. 119 (1). American Meteorological Society: 218–222. Bibcode:1991MWRv..119..218R. doi:10.1175/1520-0493(1991)119<0218:TUTCIT>2.0.CO;2.
  2. ^ Laurent, Victoire; Varney, Patrick. "Saison chaude 1988-1989". Historique des cyclones de Polynésie française de 1831 à 2010. Météo-France. pp. 134–135.
  3. ^ a b c d e f Steve Young (27 July 2015). "Monthly Global Tropical Cyclone Tracks April 2015". Australia Severe Weather. Retrieved 16 October 2017.
  4. ^ Cite error: The named reference SPAC TCOP was invoked but never defined (see the help page).
  5. ^ a b c d e Blunden, J.; D. S. Arndt (October 2016). "State of the Climate in 2015". State of the Climate. 97 (8). American Meteorological Society: 149–150. Bibcode:2016BAMS...97.....B. doi:10.1175/2016BAMSStateoftheClimate.1. hdl:1874/353366.
  6. ^ a b Cite error: The named reference Katie was invoked but never defined (see the help page).


Cite error: There are <ref group=nb> tags on this page, but the references will not show without a {{reflist|group=nb}} template (see the help page).

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