815 FXUS01 KWBC 090801 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Thu Jul 09 2026 Valid 12Z Thu Jul 09 2026 - 12Z Sat Jul 11 2026 ...There is a Slight Risk (level 2/5) of severe thunderstorms over parts of the Mid-Atlantic, Ohio Valley/Middle Mississippi Valley, and Northern/Central High Plains on Thursday... ...There is a Slight Risk (level 2/4) of excessive rainfall over parts of the Mid-Atlantic/Central Appalachians, Ohio Valley/Middle Mississippi Valley/Great Lakes and Central High Plains on Thursday... ...There is a Slight Risk (level 2/4) of excessive rainfall over parts of the Central Appalachians, Ohio Valley/Middle Mississippi Valley on Friday... Across the Southeast, hot and humid conditions will persist and likely intensify through midweek. Above-normal temperatures, high humidity, and warm overnight lows will continue to increase the risk of heat-related illnesses, especially for those without access to adequate cooling or hydration. Temperatures will also remain above normal across portions of the Southwest, Central/Northern Rockies, where Extreme Heat Watches are posted across parts of eastern Montana, most of Utah, and western Colorado starting on Friday. Furthermore, Excessive Heat Warnings remain in effect across parts of Arizona, southern California, and southwestern Utah. A front extending from the Great Lakes to the Central Plains and then northwestward to the Northern High Plains will slowly sink south and eastward to the Mid-Atlantic, to the Ohio Valley, and to the Central Plains by Saturday morning. The boundary and upper-level energy will produce showers and severe thunderstorms over the Mid-Atlantic, Ohio Valley/Middle Mississippi Valley, and Northern/Central High Plains. Therefore, the SPC has issued three areas of a Slight Risk (level 2/5) of severe thunderstorms over parts of the Mid-Atlantic, Ohio Valley/Middle Mississippi Valley, and Northern/Central High Plains through Friday morning. The hazards associated with these thunderstorms are frequent lightning and severe thunderstorm wind gusts over the Mid-Atlantic. While frequent lightning and severe thunderstorm wind gusts, hail, and a few tornadoes occurred over the Ohio Valley/Middle Mississippi Valley. Also, frequent lightning and severe thunderstorm wind gusts, hail will be over parts of the Northern/Central High Plains. Heavy rain associated with the showers and thunderstorms will produce heavy rain over parts of the Mid-Atlantic Upper/Middle Mississippi Valley to the Central Plains through Thursday morning. The WPC has issued three areas of a Slight Risk (level 2/4) of excessive rainfall over parts of the Mid-Atlantic/Central Appalachians, the Ohio Valley/Middle Mississippi Valley, and the Central Plains on Thursday. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas being the most vulnerable. In addition, showers and thunderstorms will develop over parts of the over most of the lower forty-eight states east of the Rockies. On Friday, as the front sags southward, showers and thunderstorms will develop over parts of the Central Appalachians /Ohio Valley/Middle Mississippi Valley, producing heavy rain. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Central Appalachians /Ohio Valley/Middle Mississippi Valley from Friday through Saturday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Elsewhere, an influx of moisture over the Southwest, the Great Basin, and the Southern Rockies will trigger showers and thunderstorms from late afternoon into the late evening on Thursday and Friday. Additionally, a second front extending from the Northern Plains/Northern High Plains to the Northern Intermountain Region will produce showers and thunderstorms over the Northern Plains, Upper Midwest from Thursday through Friday. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$