Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Sat Sep 01 2018 Valid 00Z Sun Sep 02 2018 - 00Z Tue Sep 04 2018 ...Thunderstorms with severe and flash flooding potential are forecast from portions of the Plains to the Upper Midwest... ...Widespread rain is expected for parts of the Southern Plains and Lower Mississippi Valley... Parts of the Plains to the Midwest will see active weather through this holiday weekend, as frontal systems create a focus for rainfall to form. The Central Plains into Iowa could see multiple rounds of rain over the next couple of days, and 2 to 3 inches of rain is forecast, with locally higher amounts. Slight risks of excessive rainfall/flash flooding are in effect. Additionally, thunderstorms could be strong to severe in these areas through Saturday night, with some chance for a strong thunderstorm on Saturday as well. As upper-level disturbances make their way through the Southwest, scattered thunderstorms are expected, particularly in the afternoon and evening hours through Monday. These storms could produce locally heavy rain. A plume of ample moisture will stream into the western and central Gulf Coast on Sunday and Monday, which will help cause widespread rain and thunderstorms in the Lower Mississippi Valley. This moisture plume is forecast to shift westward, leading to widespread rain and storms by Labor Day in parts of the Southern Plains. Though conditions have generally been dry there, enough rain falling in one location could still cause localized flash flooding. Elsewhere, scattered showers and thunderstorms are possible from the Southeast to the Northeast through the holiday weekend, with warm and humid conditions. Parts of the Mid-Atlantic are in a marginal risk of excessive rainfall/flash flooding through Saturday night with a localized flooding threat. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php