Winter Storm Severity Index
Winter Storm Severity Index Components
Snow Amount
Blowing Snow
Ground Blizzard
Ice Accumulation
Flash Freeze
The purpose of the Winter Storm Severity Index (WSSI) is to provide NWS partners and the general public with an indication of the level of winter precipitation (snow and ice) severity and its potential related societal impacts. The WSSI does not depict official warnings, and should always be used in context with official NWS forecasts and warnings. Because this is an experimental product, it may not update in a timely fashion.
Source:NOAA Weather Prediction Center.