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The Winter Storm Severity Index
WSSI does not depict official warnings and should always be used in context with official NWS forecasts and warnings.

Overall Winter Storm Impacts: Maximum impact from any of the components.

Snow Amount: Potential impact from snow amount.

Snow Load: Potential impact from the weight of snow on structures.

Ice Accumulation: Potential impact from the ice accumulation and wind.

Blowing Snow: Potential impact from falling snow combined with wind.


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Download Latest WSSI in GIS Format:
Download Data in KMZ
Download Data in SHP
REST Service Links

WSSI Static Image Archive:
WSSI Static Image Archive Data

WSSI Product Suite:
Rolling 24 HR WSSI
Probabilistic WSSI (WSSI-P)
 
For a users guide and more information about the WSSI, please select from the dropdown menu below.
 

Map Overlays
NWS County Warning Areas River Forecast Center Boundaries
FEMA Boundaries Counties Boundaries
State Boundaries NWS Public Forecast Zones
Urban Areas ARTCC/FIR
Retrieve Static Images
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Select WSSI Element
WSSI Overall Blowing Snow
Ice Accumulation Snow Amount Snow Load

To retrieve static images please select a zoom area and WSSI element.