129 FXUS01 KWBC 141950 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Tue Jul 14 2026 Valid 00Z Wed Jul 15 2026 - 00Z Fri Jul 17 2026 ...Anomalous heat and humidity continue across the Northern Plains/Upper Midwest while spreading into the Northeast today, and reaching into the Mid-Atlantic on Wednesday... ...Significant heavy rainfall likely from the Hill Country to the Big Bend regions of Texas... ...Monsoonal showers and thunderstorms develop across the interior western U.S... ...Severe thunderstorms possible today across northern New England... The persistent upper-level high and ongoing heatwave will continue to build eastward through the northern states and toward the East Coast. This weather pattern will prolong the heat and humidity across the Northern Plains to the Great Lakes where high temperatures ranging from 95 to 105 will break some daily high temperature records this afternoon. A cold front trailing from a deepening cyclone across eastern Canada will bring some cooler and drier air into the U.S.-Canadian border and keep the temperatures barely under record levels by Wednesday across the Northern Plains. Upper 90s is forecast to spread across New England today before reaching farther south into the Mid-Atlantic on Wednesday when triple digit high temperatures are possible. Extreme Heat Warnings remain in effect across a large portion of the Great Basin through the Northern Plains as Heat Advisories and some Extreme Heat Warnings are posted for areas farther east into Northeast. If you will be situated within any of these areas forecast to experience extreme heat, stay hydrated, take frequent breaks, and limit outdoor activities if possible. Severe thunderstorms are possible today across northern New England as the cold front approaches. Cooler air will penetrate deeper into New England by Thursday morning under gusty westerly winds behind the cold front. A nearly stationary front will also be sprawled from the Southern Plains to the Southeast during this period. Upper-level disturbances will likely interact with the wavy frontal boundary to produce repeated rounds of showers and thunderstorms for the southern states. Near the western end of the front, a significant heavy rainfall event is forecast to linger across the Texas Hill Country and Big Bend over the next three days as clusters of thunderstorms could mutually amplify the smaller scale upper-level disturbances to further enhance rainfall over this region under a slow-moving weather pattern. The latest rainfall forecast calls for storm total rainfall amounts of 6-8" with locally 10+ inches possible over then next couple of days, which could lead to dangerous flash flooding as soils in the area become increasingly inundated. Meanwhile, the forecast remains on track for an influx of monsoonal moisture to drive an uptick in late-day to early-evening thunderstorms over much of the Great Basin, Four Corners, and Intermountain West. Late-day thunderstorms are also forecast from the Deep South to the Southeast near the stationary front. A few instances of flash flooding and severe weather are possible in the strongest storms through midweek. Campbell/Kong/Asherman Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$