148 FXUS01 KWBC 082001 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sat Aug 08 2026 Valid 00Z Sun Aug 09 2026 - 00Z Tue Aug 11 2026 ...Heat to persist across much of the CONUS, with record highs possible across portions of the West and central Rockies/ Plains... ...Multiple rounds of strong to severe thunderstorms expected from the Plains to the Great Lakes, Northeast, and Mid-Atlantic... ...Heavy rainfall and flash flooding possible across portions of the southern Great Lakes and upper Ohio Valley... A broad upper ridge will extend across much of the southern CONUS through early next week, with a break in the ridge near the lower Mississippi Valley. This pattern will support above-normal temperatures across much of the CONUS, with the greatest temperature anomalies extending from California and the northern Intermountain West eastward to the mid Mississippi Valley. Record-breaking highs and very warm overnight lows are expected across portions of the Southwest, central Rockies, and High Plains. Meanwhile, a series of disturbances lifting out of the western Gulf and across the eastern portion of the ridge will support periods of showers and thunderstorms from parts of the southern Plains and western Gulf Coast into the Southeast. Monsoonal convection will also provide some localized relief from the heat across the Southwest and Great Basin, but these storms will pose a threat for heavy rainfall and flash flooding. Farther north, drier conditions will persist from parts of the Cascades eastward to the northern High Plains, supporting continued elevated fire weather concerns. Meanwhile, farther north, a series of upper-level disturbances will generate additional periods of showers and thunderstorms from the northern Plains through the Great Lakes, Northeast, and Mid-Atlantic. Some of these storms are expected to become strong to severe. On Sunday, a concentrated area of damaging winds and hail is expected across much of South Dakota, while scattered damaging wind gusts will also be possible from eastern Iowa across northern Illinois and Indiana. On Monday, thunderstorms capable of producing severe wind gusts will be possible from parts of northern Illinois eastward into western Pennsylvania, with isolated severe gusts also possible from portions of the central and northern Plains into the Midwest. In addition to damaging winds and hail, some of these thunderstorms will produce locally heavy rainfall and flash flooding. The greatest potential for heavy rainfall and flash flooding will be focused across the southern Great Lakes and upper Ohio Valley, where multiple rounds of convection could produce locally heavy rainfall and exacerbate flash flood concerns. Showers and thunderstorms will remain possible into early Tuesday, particularly across the Northeast and Mid-Atlantic. Pereira Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$