878 FXUS01 KWBC 092006 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun Aug 09 2026 Valid 00Z Mon Aug 10 2026 - 00Z Wed Aug 12 2026 ...Mid-summer heat persists across much of the CONUS, with record highs possible well into the 100s across the south-central High Plains... ...Severe thunderstorm and heavy rainfall threats shift eastward into the Midwest, lower Great Lakes, Ohio Valley and central Appalachians over the next couple of days... As we approach mid-August, a broad ridge of high pressure remains dominant across the southern tier states especially over the Four Corners. This pattern will maintain widespread above-normal temperatures from much of the western U.S. through the Mid-Atlantic, with record-challenging highs into the upper 90s and triple digits across the south-central High Plains for the next couple of afternoons. Along the periphery of the ridge, a series of disturbances lifting out of the western Gulf will support late-day 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, a frontal boundary meandering across the north-central U.S. will begin to shift the focus of thunderstorms along with an increasing threat of heavy rain eastward into the Midwest and lower Great Lakes through tonight into Monday, followed by the Ohio Valley and toward the central Appalachians on Tuesday. In addition, thunderstorms capable of producing severe wind gusts will be possible from parts of northern Illinois eastward into western Pennsylvania on Monday, with isolated severe gusts and hail possible from portions of the central and northern Plains into the Midwest. This is in response to a wave of low pressure sliding eastward along the meandering front, aided by an upper-level impulse sliding eastward into the Great Lakes, bringing possibly a few inches of rain with locally higher somewhere within the corridor from the Midwest to the Ohio Valley through Tuesday. The severe storm and heavy rain chances are forecast to dip further south through West Virginia on Tuesday. Meanwhile, cooler than normal temperatures will be experienced across the northern Plains where low temperatures into the 50s are forecast for the next couple of mornings near the Canadian border. Cooler than normal highs into the lower to mid 90s are found near the western Gulf Coast region where daily showers/thunderstorms are expected. Kong/Asherman/Pereira Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$