Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 406 AM EDT Fri May 30 2014 Valid 12Z Fri May 30 2014 - 12Z Sun Jun 01 2014 ...Heavy rains and the threat for flash flooding will continue along the central Gulf Coast... ...Rain and thunderstorms developing along a slow moving frontal boundary will pose a risk for flash flooding across the north central U.S.... Additional afternoons of widespread convection are expected across the southeastern quarter of the Nation as an upper low parked over the Lower Mississippi Valley gradually weakens Friday and Saturday. The majority of activity should be isolated to scattered in nature; However...a plume of moisture funneling inland over the central Gulf Coast should lead to organized areas of heavy rains and pose a risk for flash flooding. A frontal boundary sinking through the Carolinas could also be a focus for more organized activity and heavier rainfall totals. Rain and thunderstorms will continue to develop along a frontal boundary gradually edging east through the Dakotas on Friday and pushing into Minnesota on Saturday. The slow progression of the front...combined with ample amounts of moisture fueling heavy rains...will heighten the risk for flash flooding across portions of the north central U.S. late this week. Upstream...very little precipitation is expected with an upper trough swinging into the Northwest on Friday...but as the energy travels east of the Rockies and taps into a relatively moist airmass...showers and thunderstorms will become increasingly numerous across the northern Plains on Saturday. A broad upper trough will encourage scattered shower activity across New England on Friday. By Saturday...the trough should move offshore and surface ridging building in behind it should keep much of the Northeast and northern Mid-Atlantic states pleasantly dry for the first half of the weekend. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php