Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 745 PM EDT Tue Jun 8 2021 Valid 00Z Wed Jun 9 2021 - 00Z Fri Jun 11 2021 ...Widespread and locally significant flash flooding expected to continue for portions of the Lower Mississippi Valley into Wednesday morning... ...Persistent heat for much of the Great Plains along with threats for severe thunderstorms across the northern High Plains into central Montana... ...Increased chances for flash flooding from the Lower Mississippi Valley into the Tennessee and Ohio Valleys through Thursday... An active weather pattern will continue across the lower 48 through the middle of the week with threats for severe storms and flash flooding in a few locations. First, additional heavy rain is expected to impact portions of southern Arkansas and northern Louisiana into northern Mississippi where three to six inches of rain has fallen over the past 48 hours, with potential for an additional three to six inches through early Wednesday morning. Flash flood watches and warnings are already in effect for this portion of the country, so additional heavy rainfall on top of areas already impacted by flooding will only make conditions worse. Farther to the north, severe thunderstorms are expected to develop through this evening from central/eastern Montana into the western Dakotas and western Nebraska in the vicinity of a slow moving front draped roughly west to east across the northern U.S. Temperatures across the north-central U.S. will remain hot, with high temperatures forecast to remain about 15 to 25 degrees above average. Severe thunderstorm chances will remain over portions of central Montana on Wednesday before a potentially larger and more impactful severe thunderstorm threat impacts the Northern Plains again on Thursday. Hot weather will also be in place across the South where high temperatures should reach into the low to mid-100s on Wednesday and Thursday across eastern New Mexico and West Texas. Little relief in the form of rain is expected for the Southern Plains. A slow moving upper level disturbance will keep conditions unsettled for most of the eastern half of the nation. Daily chances for thunderstorms combined with above average moisture in place on top of nearly-saturated soils will keep flash flooding a concern from the Lower Mississippi Valley into the Tennessee and Ohio Valleys, as well as portions of the East Coast through Thursday. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php