902 FXUS01 KWBC 290449 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 1245 AM EDT Fri May 29 2026 Valid 12Z Fri May 29 2026 - 12Z Sun May 31 2026 ...Widespread showers and thunderstorms to persist across the Southern U.S. into the weekend.. ...An Pacific low maintains unsettled conditions and isolated severe weather across the Northwest... ...There is a Slight Risk (level 2/4) of excessive rainfall over parts of the Southeast on Friday... ...There is a Slight Risk (level 2/5) of severe thunderstorms over parts of Nebraska and Dakota on Saturday... The upper-level omega block continues to bring a broad trough over western and central U.S., while a ridging pattern will push eastward into eastern U.S. by the weekend. At the surface, a wavy frontal boundary across central Plains into the lower Mississippi Valley and Southeast will serve as a focus for repeated rounds of showers and thunderstorms. Deep moisture combined with modest instability may support localized training convection along the slow moving boundary. Therefore, Weather Prediction Center (WPC) has issued a Slight Risk (level 2/4) for excessive rainfall across portions of the Southeast, while a broad Marginal Risk (level 1/4) remains over much of mid-Mississippi Valley to the Southeast for Friday. Heading into the weekend, the Marginal Risk for excessive rainfall continues across parts of the Southeast, as the front interacts with a secondary cold front, bringing additional moisture and instability across the area. Farther west, the closed low over the Great Basin will gradually open an deject northeastward towards the northern/central Rockies through Saturday. As the frontal boundary extends across the Northern Plains/Rockies and a cold front moves into the Northwest on Friday, showers and thunderstorms will develop along the boundary where instability will be moderate to strong. Therefore, Storm Prediction Center (SPC) has issued a Marginal Risk (level 1/5) of severe thunderstorms for portions of western and northern Montana and across parts of the Plains/High Plains, with a chance for gusty winds and hail on Friday. The severe weather threat continues into Saturday with a Slight Risk (level 2/5) over western Nebraska and south Dakota, where the frontal boundary becomes reinforced and continues to strengthen as it moves eastward. WPC has also issued a Marginal Risk (level 1/4) for excessive rainfall across the northern Rockies into the High Plains through the weekend. In addition, the associated frontal system stretching across much of the Northwest and into the Plains may bring high elevation snow along the boundary. With the upper-level low over the West, cooler than average temperatures will continue from Friday into Saturday across much of western U.S. with temperatures 10-20 degrees below normal. Over the northern Rockies/Plains, 20-25 degrees above normal temperatures on Friday, will begin to moderate into the weekend. On Friday, the Northeast will start to see below normal temperatures on Friday, and will spread southward into the Mid-Atlantic by Sunday. Oudit Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$