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Weather Prediction Center

National Oceanic and Atmospheric Administration

Experimental Winter Storm Outlook (WSO)

The Winter Storm Outlook is experimental and does not depict official warnings, and should always be used in context with official NWS forecasts and warnings. Because this product is experimental, 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 Document

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Probability of Exceeding Warning Criteria (Snowfall)

Probability of Exceeding Warning Criteria (Freezing Rain)

Map Overlays
CWAs		Counties
RFCs		FEMA Regions
States		NWS Forecast Zones
Urban Areas		ARTCC/FIR

WPC PWPF Snow Forecast | Proposed Event-based Winter Storm Warning Criteria: Criteria

Download WSO Data in KMZ/KML

WPC PWPF Ice Forecast | NWS Winter Storm Warning Freezing Rain Criteria: 12 HR / 24 HR

Download WSO Data in SHP

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WSO for Snow

WSO for Freezing Rain

Weather Prediction Center National Oceanic and Atmospheric Administration

Probability of Exceeding Warning Criteria (Snowfall)

Probability of Exceeding Warning Criteria (Freezing Rain)

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Weather Prediction Center

National Oceanic and Atmospheric Administration