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PROTOTYPE PRODUCT: UNDER DEVELOPMENT AND NOT TO BE USED FOR OPERATIONAL DECISION MAKING.

Feedback from this prototype will be used to evaluate potential product development. 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 a prototype, it may not update in a timely fashion. Always check the creation and valid times. For more information, please refer to the following links: Product/Service Description DocumentWSSI Users GuideInternal Resources Page (NWS Access Only) 

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Winter Storm Severity Index

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Daily Precipitation

Click legend for a detailed description of severity levels

Click legend for a detailed description of severity levels

 

Winter Storm Severity Index Components

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Snow Amount

Snow Amount

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Snow Load

Snow Load

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Ice Accumulation

Ice Accumulation

 

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Flash Freeze

Flash Freeze

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Blowing Snow

Blowing Snow

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Ground Blizzard

Ground Blizzard

 

NDFD Forecasts

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NDFD Snow

NDFD Snow

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NDFD Ice

NDFD Ice

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NDFD Wind Gust

NDFD Wind Gust