Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 301 PM EST Fri Nov 06 2015 Valid 00Z Sat Nov 07 2015 - 00Z Mon Nov 09 2015 ...Locally heavy rain possible tonight from portions of Texas eastward into portions of the Southeast... ...Weekend rain expected for the northwestern U.S. -- changing to snow in the mountains on Sunday... An upper-level trough is moving across the northern plains and Upper Midwest this afternoon, with a cold front out ahead of the trough, extending from the lower Great Lakes across the Ohio valley and south to eastern Texas. This cold front will move off the Northeastern U.S. coast this evening, but the trailing end of the front will bring showers and thunderstorms areas from the Mid-Atlantic region to the southeastern U.S., and west to portions of Texas. An unstable air mass will be in place across the southern U.S. as anomalously warm and moist air streams into the region from the Gulf of Mexico. This air mass will support the potential for locally heavy rainfall amounts. 1 to 2 inches of additional rainfall are expected from portions of central and eastern Texas to northern Alabama and Georgia, with locally heavier amounts possible. Showers and thunderstorms should being to come to an end by Sunday evening for much of the southern U.S., but may persist along the Gulf Coast into Sunday as the frontal boundary lingers in the northern Gulf of Mexico. Behind the front, high pressure will usher a cooler air mass into the central and eastern U.S., with temperatures decreasing to near or slightly below average. A cold front will approach the Pacific Northwest tonight ahead of a vigorous upper-level trough in the northern Pacific Ocean. Rain showers will spread into coastal portions of the Northeast tonight into Saturday morning and will gradually expand inland through the day on Saturday. Ahead of the front, snow levels will be relatively high -- and precipitation should fall as rain at all but the highest elevations of the Cascades. The cold front will finally move onshore Saturday night, and snow levels will gradually decrease as the front moves inland. During the day Sunday, rain will change to snow across the Olympics and the Cascades. Rain and mountain snows will also spread across much of the Intermountain West and as far south as the Sierra Range in California. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php