Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 320 AM EST Tue Nov 07 2017 Valid 12Z Tue Nov 07 2017 - 12Z Thu Nov 09 2017 ...Heavy rain possible over parts of the Pacific Northwest and Northern California... ...Heavy rain possible over parts of the Southern Plains... ...Freezing rain possible over parts of the Columbia River Gorge... A front extending from the Carolinas roughly westward to the Southern High Plains will slowly move southeastward off most of the Southeast Coast and the Gulf Coast by Wednesday evening. Showers and thunderstorms will develop over parts of the Ohio/Tennessee Valleys into parts of the Middle/Lower Mississippi Valley that will move eastward off the Southeast Coast by Wednesday morning. Rain will develop over parts of the Central Appalachians/Northern Mid-Atlantic on Tuesday, moving off the Northern Mid-Atlantic Coast overnight Tuesday. Upper-level energy over the Great Basin/Central Rockies and Southern California will move southeastward to the Southern Plains by Wednesday into Thursday. The upper-level energy will produce snow and lower elevation rain over parts of the Central Rockies and into parts of the Southern Rockies and Southern/Central High Plains on Tuesday, ending on Wednesday morning. On Tuesday evening, moisture from the Gulf of Mexico will move northwestward over the Southern Plains through Wednesday evening. Rain and thunderstorms will develop over parts of the Southern Plains overnight Tuesday that will expand into the Lower Mississippi Valley by Wednesday morning and into the Southeast by Wednesday evening. Meanwhile, lake effect snow will develop over parts of the Upper Peninsula of Michigan on Tuesday into Tuesday evening. Additionally, a front over South-Central Canada will move into the Upper Midwest overnight Tuesday into Wednesday. Light snow will develop over parts of the Upper Midwest on Wednesday into Wednesday evening. Furthermore, a front over the Eastern Pacific will approach the Pacific Northwest Coast on Wednesday. As the moisture and energy associated with the system begin to move inland, the snow levels will be very high over the Northwest so snow will develop only over the highest elevations of the Cascades and Northern California on Wednesday. Rain and the highest elevation snow will move inland on Wednesday morning expanding inland over the Pacific Northwest and Northern California on Wednesday into Wednesday evening. There is a chance of freezing rain developing over parts of the Columbia River Gorge on Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php