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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;">The Experimental Winter Storm Outlook (WSO) Freezing Rain </SPAN><SPAN>uses Weather Prediction Center’s (WPC's) winter weather ensemble suite to depict the probability of exceeding event-based NWS Winter Storm Warning criteria for ice for the Day 1-4 period within the contiguous United States (CONUS). The products consist of four individual 24-hour outlooks issued on the night shift by 0900 UTC (one each for Day 1, 2, 3 and 4 with 1200 to 1200 Coordinated Universal Time (UTC) valid times). The underlying data for the probabilities of exceeding local warning criteria is produced for each 6-hour time step. These four outlooks will be subsequently updated on the day shift by 2100 UTC for the same valid times. In addition to the four individual days, a summary product is issued that depicts the maximum probability across all time ranges (Days 1 to 4).</SPAN></P><P><SPAN>The Experimental Winter Storm Outlook(WSO) is based on a combination of the WPC's Probabilistic Winter Precipitation Forecasts (PWPF) and local National Weather Service (NWS) snow warning criteria. Therefore, the WSO provides an early alert to hazardous winter weather conditions in a similar fashion to other national center outlooks, and also assists with NWS Winter Storm Watch and Warning decision making. The WSO will exploit a robust winter weather ensemble specifically tuned to Weather Forecast Office (WFO) Winter Storm Warning criteria. Ice accumulation criteria was already event-based, and previous versions of the WSO used the same underlying criteria for 12- and 24-hour accumulation periods. Therefore, the outlooks will now depict the probability of exceeding event-based Winter Storm Warning criteria for ice over the next four days for any given location in the contiguous United States (CONUS). PWPF, already utilized by WFOs across the NWS, forms the foundation of WPC’s WSOs while WFOs retain Winter Storm Watch issuance responsibility.</SPAN></P><P><SPAN>Link to </SPAN><A href="https://www.wpc.ncep.noaa.gov:443/wwd/wso/" STYLE="text-decoration:underline;"><SPAN>Graphical webpage</SPAN></A></P><P><SPAN>Link to data download(shapefile): </SPAN><A href="https://www.wpc.ncep.noaa.gov:443/wwd/wso/shp/" STYLE="text-decoration:underline;"><SPAN>https://www.wpc.ncep.noaa.gov/wwd/wso/shp/</SPAN></A></P><P><SPAN>Link to metadata: </SPAN><A href="https://www.weather.gov:443/gis/IDP-GISRestMetadata" STYLE="text-decoration:underline;"><SPAN>https://www.weather.gov/gis/IDP-GISRestMetadata</SPAN></A></P><P><SPAN>Questions/Concerns about the service, please contact the </SPAN><A href="mailto:nws.mapservices@noaa.gov:25" STYLE="text-decoration:underline;"><SPAN>DISS-GIS </SPAN></A><SPAN>team</SPAN></P><P><SPAN>You can provide feedback at :</SPAN><A href="https://www.surveymonkey.com:443/r/winterstormoutlook2022-2023" STYLE="text-decoration:underline;"><SPAN>https://www.surveymonkey.com/r/winterstormoutlook2022-2023</SPAN></A></P></DIV></DIV></DIV>
Copyright Text: NOAA, National Weather Service, Weather Prediction Center
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