Lightning activity level: Difference between revisions
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'''Lightning activity level (LAL)''' is a scale |
'''Lightning activity level (LAL)''' is a scale that describes degrees of [[lightning]] activity. Values are labeled 1–6.<ref name=NWS/LAL>{{cite web|title=Lightning Activity Level (LAL)|url=http://graphical.weather.gov/definitions/defineLAL.html|publisher=NOAA / NWS|accessdate=18 March 2014}}</ref> |
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Revision as of 18:20, 27 November 2016
Lightning activity level (LAL) is a scale that describes degrees of lightning activity. Values are labeled 1–6.[1]
| Level | Description |
|---|---|
| 1 | No thunderstorms |
| 2 | Isolated thunderstorms. Lightning is very infrequent, 1–5 cloud-to-ground strikes in a five-minute period. |
| 3 | Widely scattered thunderstorms. Lightning is infrequent, 6–10 cloud-to-ground strikes in a five-minute period. |
| 4 | Scattered thunderstorms. Lightning is frequent, 11–15 cloud-to-ground strikes in a 5-minute period. |
| 5 | Numerous thunderstorms. Lightning is frequent and intense, greater than 15 cloud-to-ground strikes in a five-minute period. |
| 6 | Dry lightning (same as LAL 3 but without rain). This type of lightning has the potential for starting fires, and is normally highlighted in fire weather forecasts with a red flag warning. |
References
- ^ "Lightning Activity Level (LAL)". NOAA / NWS. Retrieved 18 March 2014.
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