676 FXUS01 KWBC 272000 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Wed May 27 2026 Valid 00Z Thu May 28 2026 - 00Z Sat May 30 2026 ...Rounds of heavy rain and thunderstorms continue for much of the Southern U.S. through late week... ...Unsettled weather lingers across parts of the West as a slow-moving Pacific low spins over California and the Great Basin... ...Summerlike heat persists for the northern Rockies/Plains and Upper Midwest with widespread high temperatures well into the 80s and 90s... Very moist Gulf air south of a meandering frontal boundary across the southern U.S. will continue to lead to widespread showers and thunderstorms the next few days in an overall wet pattern. The focus through the rest of this evening will be along the boundary from the Mid-Atlantic west through the central Appalachians/Ohio Valley and into the central/southern Plains. A few more potent thunderstorms are expected through the southern Mid-Atlantic into the central Appalachians/Ohio Valley with locally heavy rainfall and severe weather possible. A Slight Risk of Excessive rainfall (level 2/4) remains in effect as some scattered instances of flash flooding are possible, and the Storm Prediction Center has also outlined a Slight Risk of severe weather (level 2/5) mainly for the threat of some damaging winds. Another Slight Risk of Excessive rainfall is also in effect across portions of the western to central Gulf Coast, though the threat should taper off into the evening hours. Additional rounds of storms are forecast both Thursday and Friday with the focus shifting into the Ozarks and Southeast as the boundary slides a bit further southward. At least isolated instances of flash flooding will remain possible. A deep Pacific upper-low remains entrenched over the western U.S. with only slow eastward progress expected through the next couple days. Showers and thunderstorms will continue broadly from central/northern California into the Pacific Northwest and east into the northern Rockies today and tomorrow before centering on the northern Great Basin/Rockies by Friday. Some isolated flash flooding is possible especially for the northern Rockies due to more sensitive mountainous terrain and burn scars. Elsewhere, an upper-low dropping south from southeastern Canada will help to spin up a low pressure/frontal system into New England late Thursday into Friday bringing showers an thunderstorms. Some of the rainfall may be heavy, particularly across central New England into southern Maine. Most of the Midwest and Southwest should remain dry. Temperatures in general remain a bit flipped flopped across the lower 48 this week as below average temperatures are favored across the southern U.S. with above average temperatures to the north. Hot summerlike heat has persisted particularly for the northern Rockies/Great Basin into the northern Plains and Upper Midwest, where highs into the 90s are upwards of 25-35 degrees above average. Meanwhile, temperatures are well below average across California, the Great Basin, and the Southwest under the aforementioned deep upper-low. Forecast highs are generally in the 50s and 60s outside of the Desert Southwest where relatively warmer but still below average highs into the 80s and low 90s are expected. Temperatures will remain closer to average further east from the south-central U.S. to East Coast with 80s common further south and 70s further north. Conditions will be a bit cooler with mean troughing in place over New England, with highs in the 60s. Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$