Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 327 AM EST Wed Nov 08 2017 Valid 12Z Wed Nov 08 2017 - 12Z Fri Nov 10 2017 ...Heavy possible over the Upper Great Lakes... ...Heavy rain possible for parts of the Pacific Northwest and Northern/Central California... ...Temperatures will be 10 to 20 degrees below average over parts Southern Plains into Lower Mississippi Valley... A front extending from the Southeast to the Western Gulf Coast will move southward into the Gulf of Mexico and eastward over the Western Atlantic by Wednesday evening, continuing to move southeastward to the southern tip of Florida by Thursday evening. Showers and thunderstorms will develop from the Western Gulf Coast to the Central Gulf Coast on Wednesday that will end over the Western Gulf Coast by Wednesday afternoon. The showers and thunderstorms will expand into parts of the Eastern Gulf Coast and the Southeast by Wednesday evening, ending over the Central Gulf Coast by Thursday morning. The showers and thunderstorms will end over the Southeast by Thursday afternoon into evening. In addition, rain will develop over parts of the Southern Rockies eastward into the Southern Ohio Valley/Tennessee Valley to parts of the Southern Mid-Atlantic on Wednesday morning. The rain will move into the Western Gulf Coast by Wednesday afternoon into evening and into the Central Gulf Coast by Wednesday evening. The rain will end over the Western/Central Gulf Coast by Thursday morning into afternoon. The rain ends over the Ohio/Tennessee Valleys on Thursday morning into afternoon. Rain will also extend from parts of the Southern Mid-Atlantic into the Southeast on Thursday into Thursday evening. Meanwhile, a front over the Upper Midwest will move southeastward to the Lower Great Lakes/Ohio Valley to the Southern Plains/Lower Mississippi Valley by Thursday evening. Light snow will develop over parts of the Upper Great Lakes and the Northern Plains by Wednesday afternoon that will expand into the Upper Mississippi Valley by Wednesday evening. The snow ends over the Northern Plains overnight Wednesday and over the Upper Mississippi Valley by Thursday evening. The snow will move into the Lower Great Lakes Thursday afternoon into evening. A third front will move onshore over the West Coast overnight Wednesday that will move eastward to the Northern Rockies to the Great Basin and Southern California by Thursday evening. Rain and snow will develop at the highest elevations of the Pacific Northwest and Northern/Central California on Wednesday afternoon. The rain and highest elevation snow will extend into parts of the Great Basin and the Northern Intermountain Region by Thursday morning. The rain and highest elevation snow will continue to expand eastward into the Northern Rockies by Thursday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php