843 FXUS01 KWBC 210807 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Thu May 21 2026 Valid 12Z Thu May 21 2026 - 12Z Sat May 23 2026 ...Rounds of strong to severe thunderstorms continue from the central High Plains southward to Texas and across the Deep South... ...A wet pattern setting up across the eastern U.S. heading into the Memorial Day weekend... ...A round of high-elevation snow for the northern to central Rockies as rain and embedded thunderstorms spread across the lower elevations and into the northern Plains... A rather convoluted weather pattern is setting up across the eastern two-thirds of the country as multiple disturbances ejecting out of the western U.S. upper trough will interact with one another over the midsection of the country. These wave ejections will sustain multiple rounds of strong to severe thunderstorms eastward from the central to southern High Plains over the next couple of days. These thunderstorms appear most active today across Oklahoma and Texas followed by a lull on Friday as a low pressure system consolidates and moves east into the lower to mid-Mississippi Valley. However, the next round of strong thunderstorms could resume Friday night across the southern High Plains. Meanwhile, the eastern U.S. is entering a period of wet weather through the next couple of days heading into the Memorial Day weekend. The low pressure system consolidating over the lower to mid-Mississippi Valley on Friday is forecast to gradually intensify and track into the Midwest to reach the Ohio Valley by Saturday morning. This system will bring some beneficial rainfall into the eastern U.S. but the timing of the rain will be during the Memorial Day weekend. Damp and cool weather will be in stark contrast to the recent heatwave from the Mid-Atlantic to New England while very warm and humid conditions with scattered thunderstorms will remain across the Southeast. Widespread rainfall amounts of 1 to 2 inches can be expected from the Deep South to the Ohio Valley and into the Carolinas and Mid-Atlantic through Saturday morning. Meanwhile, another upper trough from western Canada is dipping into the northern Rockies. This system is bringing a broadening area of rain and high-elevation snow from the northern Rockies into the northern High Plains. A round of wet snow is expected to reach as far south as the Front Range this evening. By Friday, a compact low pressure system developing along a cold front will bring a round of rain and some embedded thunderstorms across the northern and central Plains. Much of the rain will reach into the upper Midwest by Saturday morning. In contrast to the wet weather from the Plains eastward, milder and drier conditions are expected along the West Coast and most of the Great Basin where temperatures will be warming through the end of the week with highs reaching well up into the 90s in the Central Valley of California. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$