Lightning Activity Level

1. Part of the National Fire Danger Rating System (NFDRS). A number, on a scale of 1 to 6, which reflects frequency and character of cloud-to-ground lightning (forecasted or observed).The scale for 1 to 5 is exponential, based on powers of 2 (i.e., LAL 3 indicates twice the lightning of LAL 2). LAL 6 is a special category for dry lightning and is closely equivalent to LAL 3 in strike frequency.
2. A number, on a scale of 1 to 6, that reflects frequency and character of cloud-to-ground lightning. The scale is exponential, based on powers of 2 (i.e., LAL 3 indicates twice the lightning of LAL 2).
3. A NUMERICAL RATING OF 1 TO 6, KEYED TO THE START OF THUNDERSTORMS AND THE FREQUENCY AND CHARACTER OF CLOUD-TO-GROUND LIGHTNING, FORECASTED OR OBSERVED ON A RATING AREA DURING THE RATING PERIOD.