019 FXUS01 KWBC 060708 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 307 AM EDT Thu Aug 06 2026 Valid 12Z Thu Aug 06 2026 - 12Z Sat Aug 08 2026 ...There is a Slight Risk (level 2/5) of severe thunderstorms over parts of the Middle Mississippi Valley/Central/Southern Plains on Thursday... ...There is a Marginal Risk (level 1/4) of excessive rainfall over parts of the South Carolina Coast and the Upper Great Lakes, Middle Mississippi Valley into the Central Plains on Wednesday... ...Poor air quality for the Pacific Northwest and Great Basin... A front extending from the Great Lakes to the Middle Mississippi Valley into the Central/Southern Plains will slowly dissipate on Friday. Moisture-rich air over the eastern part of the country will aid in producing showers and thunderstorms from the Northeast into the Great Lakes, Southeast to the Middle Mississippi Valley, and into the Central/Southern Plains through Saturday. Showers and thunderstorms will focus over parts of the Middle Mississippi Valley/Central/Southern Plains, and some storms will become severe. Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Middle Mississippi Valley/Central/Southern Plains through Friday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes. In addition, the WPC has issued a Marginal Risk (level 1/4) of excessive rainfall over the country, from the Northeast to the Southeast and from the Lower Great Lakes/Ohio Valley southwestward to the Central/Southern Plains, on Thursday into Friday. The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain. Moreover, monsoonal moisture will produce showers and thunderstorms with moderate to heavy rain over parts of the Southwest during the late afternoon into the late evening through Saturday. The WPC has issued a Marginal Risk (level 1/4) of excessive rainfall over parts of the Southwest. Furthermore, a second front moving southward out of Central Canada will move into parts of the Upper Midwest and Northern Plains overnight Thursday into Friday and into the Lower Great Lakes/Ohio Valley on Friday into Saturday. The boundary will trigger scattered showers and thunderstorms over parts of the Upper Midwest Thursday evening into Friday. Showers and thunderstorms will continue over parts of the Lower Great Lakes into the Ohio Valley on Saturday. In the Northwest, ongoing fires will lead to persistent smoke in the region, from Washington/Oregon eastward and also over the Great Basin with separate fires. Air quality alerts are in effect for much of the region. Some members of the public may experience health effects. Members of sensitive groups may experience more serious health effects. This includes children, the elderly, and persons with respiratory problems. Temperatures will trend warmer over the next couple of days, leading to Moderate HeatRisk levels (3 out of 5). Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$