Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 309 AM EDT Thu Aug 08 2019 Valid 12Z Thu Aug 08 2019 - 12Z Sat Aug 10 2019 ...Multiple rounds of heavy rain with potential for flash flooding from portions of eastern Kansas into Missouri through Friday morning... ...Severe thunderstorms and locally heavy rainfall possible from the lower Great Lakes into the Ohio Valley on Thursday, and the northern Plains on Friday... ...Relief from the heat and stormy weather for the Northwest while Heat Advisories remain across portions of the south-central U.S... A complex of strong to severe thunderstorms and heavy rainfall overnight across portions of Kansas into Missouri and Arkansas will slowly weaken throughout the morning hours of Thursday. However, another round of heavy rainfall is expected from parts of the Central Plains into the middle Mississippi Valley on Thursday night into Friday morning, likely overlapping with some of the same locations from this morning. There is potential for multi-day rainfall totals of several inches from roughly southeast Kansas into northern Arkansas with flooding and flash flooding a threat. Unsettled weather is likely today along and ahead of a cold front from the lower Great Lakes into the Ohio Valley, with severe weather and locally heavy rainfall possible. On Friday, the western portion of this boundary drops into the Northern Plains bringing a risk for severe thunderstorms and locally heavy rainfall to that region. To the south, showers and thunderstorms are likely along a weakening frontal boundary, with locally heavy rainfall possible, especially for portions of the mid to lower Mississippi Valley and the Tennessee Valley. Upper level ridging across the south-central U.S. will result in very hot and humid conditions from the Southern Plains into the lower Mississippi Valley where heat advisories are in effect and daytime highs could exceed 100 degrees. Monsoonal moisture on the west side of this ridge will also continue to contribute to diurnally driven showers and storms from the Four Corners into the Rockies. Out West, heat advisories also remain in effect through Thursday across portions of interior Washington, though temperatures should cool to near normal by Friday as a system slides inland from the eastern Pacific. This system will increase storm chances across the Pacific Northwest for the end of the work week, with SPC showing a slight risk for severe thunderstorms across central Oregon. Meanwhile, hot and dry conditions will continue across parts of the central Great Basin through Friday leading to an elevated risk for fire weather. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php