Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 455 AM EDT Tue Mar 10 2015 Valid 12Z Tue Mar 10 2015 - 12Z Thu Mar 12 2015 ...Heavy rains and flash flooding will be possible along a frontal boundary stretched from the central Gulf coast to the Mid-Atlantic region... ...Conditions will become increasingly wet out West... A steady stream of moisture lifting northward out of the Gulf of Mexico will continue to fuel heavy rains and thunderstorms along a frontal boundary stretched from the central Gulf coast to the Mid-Atlantic region. The front will be sluggish to press south and east the next few days...leading to repeated rounds of intense rainfall for some locations. The greatest threat for any flash flooding will be over portions of the Lower Mississippi Valley. Also...a melting snow pack combined with heavy rains will heighten the risk for flash flooding across the upper Tennessee Valley and central Appalachians. Conditions will become increasingly wet out West as a Pacific front approaches the coast. Rain should reach the Pacific Northwest and northern California by late Tuesday night...and precipitation is expected to spread inland across a large portion of the Intermountain West and northern to central Rockies on Wednesday. Totals should generally be light to moderate...with the exception of the some heavier amounts along the coast and favored terrain. Any snow should be confined to the highest elevations. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php