Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 341 PM EDT Fri Jul 11 2014 Valid 00Z Sat Jul 12 2014 - 00Z Mon Jul 14 2014 ...Heavy rain and strong thunderstorms is expected to impact portions of the central Plains to the Midwest... ...Scattered showers and thundershowers to persist across the Southeast and Southwest... ...Unseasonably cool weather expected to begin impacting the northern tier of the U.S. by Sunday... A large area of showers and thunderstorms is expected to develop across the central Plains tonight, and progress into the Midwest and Ohio Valley by tomorrow and Sunday. Due to the interaction of warmer air to the south, cooler air moving in from the north, and moisture streaming up through the Southwestern U.S. and central Rockies, there should be plenty of instability and moisture present to fuel these storms over the next couple of days. A narrow band of more organized thunderstorms is expected to develop to the north of a frontal boundary currently draped through the central Plains and move across the Mid-Mississippi Valley tomorrow and into the Midwest by the evening. Some of the storms could be capable of producing severe weather and flash flooding. Elsewhere, showers and thunderstorms continue to persist across the Southeast and Southwest portions of the country. In the southeast, a slowly weakening stationary boundary, combined with already hot and humid conditions, will keep the wet weather in the forecast all weekend. Back west, monsoonal flow funneling northward out of the Tropical Pacific will also keep the Southwest and central Rockies wet all weekend as well. Finally, a well advertised and usually large shot of unseasonably cool air is expected to plunge southward into the Northern Plains and Upper Midwest states by Sunday. High temperatures for the day may struggle to even get out of the 60s, which is well below normal and may feel more typical of autumn than summer! Monarski Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php