Winter
Storm Classifications
Insignifigant
Event
Less than 1/4 of ice or less than 3 inches
of snow
Minor Icing Event (1)
-- 1/4 to 1/2 of any form of ice.
Major Icing Event (2)
-- More than 1/2 of ice.
Light Snow Event (CAT-1)
-- 3 to 5 inches of snow
Moderate Snow Event (CAT-2)
-- 6
to 9 inches of snow
Heavy Snow Event (CAT-3)
-- 10
to 14 inches of snow
Major Snow Event (CAT-4)
--
15 to 20 inches of snow
Historical Snow Event (CAT-5)
--
More than 20 inches of snow
