Lightning activity level
 | This article relies on a single source. (March 2024) |
Lightning activity level (LAL) is a scale that describes degrees and types of lightning activity. Values are labeled 1–6.[1] This system is no longer used in wildland fire forecasts.[2]
| 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
[edit]- ↑ "Lightning Activity Level (LAL)". NOAA / NWS. Retrieved 4 July 2024.
- ↑ "Replacing Haines Index and Lightning Activity Level". NWCG. 2026-02-06. Retrieved 2026-04-10.
External links
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