Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 AM EDT Sat Jun 20 2015 Valid 12Z Sat Jun 20 2015 - 12Z Mon Jun 22 2015 ...There is a slight risk of severe thunderstorms for parts of the Mid-Atlantic and the Middle Mississippi Valley... ...The remains of Tropical Depression Bill will produce heavy rain from parts of the Central Appalachians to the Northern Mid-Atlantic Coast... The remains of Tropical Depression Bill will slowly move from the Western Ohio Valley eastward off the Mid-Atlantic Coast by Sunday evening. The system will produce showers and thunderstorms from parts of the Ohio/Tennessee Valleys eastward to the Mid-Atlantic that will move off the Northern Mid-Atlantic Coast on Sunday. Meanwhile, a front extending from the Upper Mississippi Valley to the Central Rockies will advance eastward to the Lower Great Lakes to the Middle Mississippi Valley westward to the Central Rockies by Sunday evening. Showers and thunderstorms will develop along and ahead of the boundary over the Upper Mississippi Valley/Upper Great Lakes that will move eastward to the Northeast/Central Appalachians by Sunday evening. In addition, upper-level energy moving across the Northern/Central Plains to parts of the Middle Mississippi Valley will produce showers and thunderstorms over parts of the Northern/Central Plains on late Saturday night moving to parts of the Middle Mississippi Valley by Sunday evening. Another area of showers and thunderstorms will develop over parts of the Northern Plains on Sunday evening. A second area of upper-level energy will aid in producing showers and thunderstorms over parts of the Lower Rio Grande Valley on Saturday into Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php