Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 354 PM EDT Wed Aug 21 2013 Valid 00Z Thu Aug 22 2013 - 00Z Sat Aug 24 2013 ...Organized areas of showers and thunderstorms across the Upper Lakes and into the Central Plains likely through Thursday morning... ...Showers and thunderstorms possible across the Southeast and parts of the West... A front stretched from southeast Canada, across the Upper Midwest/Central Plains and into the Northern Rockies, will continue to race eastward towards the East Coast. Scattered showers and thunderstorms are expected to pop up all along the boundary from the Upper Lakes to the Central Plains on Thursday morning. Small impulses of upper level energy along the frontal boundary could trigger some more organized convection across the Upper Great Lakes and Upper Midwest as well as portions of the Central Plains through Thursday, with the possibility of severe weather looming this evening and into the early morning hours of Thursday. By Thursday afternoon, the front will begin to push into the Lower Great Lakes and across the Ohio Valley which should increase the chances for showers and thunderstorms from the Northeast to the Middle Mississippi Valley. Favorable easterly flow off the Atlantic Ocean from the surface high pressure parked offshore, along with plenty of deep moisture, will remain across the Southeast region through the entire forecast period. This should continue to keep isolated to scattered showers and thunderstorms in the forecast from the Carolinas to the Gulf Coast for the rest of the work week. Out west, an upper level low moving into Northern California and eventually across the Pacific Northwest could trigger some showers and thunderstorms across Northern California and into the Intermountain west on Thursday and Friday. Elsewhere, smaller pieces of upper energy, combined with diurnal heating and monsoonal moisture should keep the showers and thunderstorms in the forecast for parts of the Southwest and Great Basin as well as into the Central Rockies. Monarski Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php