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Winter Storm Classifications
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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