475 FXUS01 KWBC 081955 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 353 PM EDT Wed Jul 08 2026 Valid 00Z Thu Jul 09 2026 - 00Z Sat Jul 11 2026 ...Severe weather over the Plains to the Upper Midwest and Ohio Valley... ...Dangerously hot temperatures continue for the Southwest and Southeast... ...Locally heavy rainfall and flash flooding possible for many areas east of the Rockies... A decidedly summertime pattern will hold over much of the Lower 48 over the next couple of days. A frontal boundary from the Pacific Northwest to the Great Lakes will delineate a line between warm/hot and humid air to the south versus milder air to the north (mostly over Canada). Along and ahead of this front, showers and thunderstorms will organize and may produce both severe weather and flash flooding due to locally heavy rainfall this afternoon/evening. In addition, another frontal boundary over the southern Plains through the Tennessee Valley to the southern Mid-Atlantic will also favor showers and thunderstorms with locally heavy rainfall. The northern front will push southward and eastward tonight into Thursday, moving the threat into the Midwest and Ohio Valley. The wavy front over the Tennessee Valley may lift just enough northward to bring moisture into the Mid-Atlantic tomorrow, with a chance of locally heavy rain and flash flooding for areas of northern Virginia through Maryland into southeastern Pennsylvania and southern New Jersey. Though both the Storm Prediction Center and the Weather Prediction Center indicate Slight Risk areas, some storms may be rather severe for particular locations given the humid air mass. Furthermore, areas that see persistent heavy rainfall may see locally high amounts of several inches with impacts that could be exacerbated over urban areas. Most of the Lower 48 will be under the influence of a heat dome, broken across the southern tier. This will favor near to above normal temperatures at what is near or nearing the hottest time of the year. For parts of the Southwest, this will lead to temperatures well into the 100s for the lower elevations and into the 110s for the typically hotter locations. Over the Southeast, upper 90s are forecast for parts of Florida which will see little relief from afternoon thunderstorms due to the suppression of such development from the heat dome. Overnight lows will only drop into the mid/upper 70s to low 80s, leaving little time to cool off at night. The combination of the heat, humidity, and duration leads to Major to Extreme levels of HeatRisk over the Southeast/Florida -- anyone without adequate access to cooling/hydration would be susceptible to heat-related illness. Fracasso Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$