LALs
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(L)ightning (A)ctivity (L)evels.
LAL 1 - No thunderstorms.
LAL 2 - Few building cumulus with isolated thunderstorms.
LAL 3 - Much building cumulus with scattered thunderstorms. Light to moderate rain.
LAL 4 - Thunderstorms common. Moderate to heavy rain reaching the ground.
LAL 5 - Numerous thunderstorms. Moderate to heavy rain reaching the ground.
LAL 6 - Dry lightning (same as LAL 3 but without the rain).
NOAA National Weather Service - Cite This Source - This Definition- Anvil Crawler, Anvil Zits, CA, CC, CG, CSDRBL, Heat Lightning, In-Cloud Lightning, LDS, Lightning, Lightning Discharge, LTNG, Positive Cloud to Ground Lightning, St. Elmo\'s Fire, Staccato Lightning, Thunder, Thunderstorm