Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 439 PM EDT Fri Mar 20 2015 Valid 00Z Sat Mar 21 2015 - 00Z Mon Mar 23 2015 ...Heavy rains could lead to flash flooding across Texas and the Lower Mississippi Valley... Showers and thunderstorms will continue to fire up along a frontal boundary stretched through the southern tier of the Nation this weekend. Strong southerly winds ahead of an upper trough edging east through northern Mexico will stream a steady plume of moisture northward out of the Gulf of Mexico. The abundant moisture should feed an organized axis of precipitation developing over eastern Texas Friday night into Saturday...which could lead to heavy rains and flash flooding across portions of the Lone Star state. The threat for flash flooding should gradually shift into the Lower Mississippi Valley Saturday night as the upper trough and plume of Gulf moisture progress eastward. Elsewhere across the Country...spring snows should continue to clear out across the Mid-Atlantic region...but a surface low deepening offshore could graze coastal New England with light snow while it tracks up the Eastern Seaboard on Saturday. Light rain and snow showers will be possible with a cold front while it crosses the Great Lakes Friday night and pushes through the Northeast on Saturday. A series of Pacific fronts approaching the West coast will keep conditions unsettled across the Pacific Northwest and northern Rockies this weekend...and precipitation should breakout across the Dakotas on Sunday as the energy aloft from the first Pacific front ejects east of the Rockies. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php