Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 455 AM EDT Mon Mar 09 2015 Valid 12Z Mon Mar 09 2015 - 12Z Wed Mar 11 2015 ...The flash flood threat will continue over eastern Texas on Monday... Widespread precipitation will continue to develop ahead of an upper trough edging eastward out of northern Mexico on Monday. A rich supply of Gulf moisture feeding into the precipitation will fuel heavy rains and thunderstorms...which could lead to flash flooding over eastern Texas and into portions of the Lower Mississippi Valley. As the upper trough lifts north Monday night into Tuesday...the heavy rains and threat for flash flooding will shift northeastward across the Tennessee Valley...lower Ohio Valley...and central Appalachians. Weather over the rest of the Nation will remain relatively quiet early this week. Much of the central and eastern U.S. will continue to thaw out with above normal temperatures. Light snows will be possible with a weak upper disturbance streaking through the Northeast on Monday...and an upstream system grazing the Upper Great Lakes could trigger light snow showers on Tuesday. An upper ridge out West will keep conditions warm and dry on Monday...but an approaching Pacific front should bring precipitation into the West Coast by the middle of the week. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php