Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 402 PM EDT Tue Aug 08 2017 Valid 00Z Wed Aug 09 2017 - 00Z Fri Aug 11 2017 ...Showers and thunderstorms expected throughout the Southeast and southern Plains... ...Precipitation to develop along the front from the Great Lakes to the northern Plains... ...Thunderstorms expected to develop in the central Plains and move into the Middle Mississippi Valley... A cold front will advance southward into the Southeast and southern Plains through tonight--eventually stalling in these regions and lifting northward as a warm front on Wednesday. Over the next few days, this slow moving boundary will provide focus for showers and thunderstorms to continue across the Carolinas and the Gulf Coast region. Some of these storms could produce heavy downpours which may lead to flash flooding. Slight risks of excessive rainfall have been issued in various areas in Southeast Texas and the Southeast--see WPC's excessive rainfall forecasts for more information. Another cold front is sweeping across the Great Lakes and northern Plains this evening. The front is expected to stall along the Great Lakes, while the cold front in the northern Plains continues an eastward progression toward the Upper Midwest on Wednesday and Thursday. Convection will develop along and ahead of the front by Wednesday and will move into the Upper Midwest in the evening. Widespread showers and thunderstorms are expected to persist throughout the day on Thursday. Meanwhile, heavy rainfall is also expected to develop in the central Plains as an upper level disturbance moves out of the Rockies and crosses over the Plains by Wednesday afternoon. The area of heavy rainfall will move toward the Middle Mississippi Valley overnight and arrive by Thursday. Flash flooding will be a potential threat along with a marginal risk for severe weather. In addition, an upper level low stalling over northern California lead to an increase of isolated showers and thunderstorms across parts of California and the Great Basin--occurring mostly during the afternoon and evening with the help of daytime heating. Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php