760 FXUS01 KWBC 282001 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Tue Apr 28 2026 Valid 00Z Wed Apr 29 2026 - 00Z Fri May 01 2026 ...Severe weather and flash flood threat continues through tonight across the Tennessee/Lower Mississippi Valleys west into north Texas... ...Another threat for flash flooding will return to portions of central and eastern Texas Thursday... ...A cold front will bring cooler, below average temperatures to most of the central/eastern U.S. while the western U.S. trends warmer the next few days... Widespread thunderstorms will continue through this evening and into the overnight hours ahead of a quasi-stationary boundary stretching from the Tennessee Valley west through the Lower Mississippi Valley, ArkLaTex, and into north Texas. Continual strong winds aloft and strong to extreme instability as high moisture pools along the boundary will promote robust storms capable of all severe hazards. The Storm Prediction Center has upgraded to a Moderate Risk (level 4/5) over northeast Texas where a several instances of very large to giant hail will be possible. A broader Enhanced (level 3/5) risk extends east to the Lower Mississippi Valley with a Slight Risk (level 2/5) into the Tennessee Valley for the threat of large hail, damaging wind gusts, and a few tornadoes. Heavy downpour-producing storms given the moisture in place are expected to become more widespread and back-build into the evening hours leading to scattered instances of flash flooding, with a Slight Risk of Excessive Rainfall (level 2/4) in place across the region. Additional thunderstorms will also be possible ahead of the cold front further north into the Ohio Valley. The front will continue eastward/southward into Wednesday with storms forecast along most of the East Coast southwest through the Southeast and into Texas. While instability will not be as strong compared to today, some isolated severe thunderstorms and instances of flash flooding will remain possible. The front will clear most of the East Coast by Thursday with some lingering storms in New England, but slower movement with southwestward extent will lead to continued thunderstorm chances west along the Gulf Coast and into Texas/New Mexico. An incoming southern stream upper-wave will help promote more widespread development especially into Thursday night across portions of Texas west into New Mexico with heavy downpours and flash flooding possible. A Slight Risk of Excessive Rainfall covers portions of central and eastern Texas where the greatest threat for scattered instances of flash flooding is currently expected. Elsewhere, energetic upper-flow over the northern/central Rockies and adjacent High Plains will bring some scattered showers over the next couple of days, with snow possible for higher mountain elevations. The approach of the more substantial upper-wave over the Southwest to south-central U.S. will encourage more widespread, heavier precipitation across the central Rockies/adjacent High Plains Thursday. Heavy snow is forecast for the mountains with the potential that some snow may mix in for the foothills/Palmer Divide. The passing cold front will bring increasingly more widespread cooler, below average temperatures to the central/eastern U.S. over the next few days. Highs into 80s will be limited to the Southeast and Texas by tomorrow, with most locations falling into the 60s to mid-70s by Thursday outside of the Gulf Coast. Forecast highs in the 40s and 50s will be common across the northern tier as well as south into the central High Plains. Meanwhile, much of the western U.S. will see highs trend upward from around average to above average through mid-week. Highs generally in the 50s and 60s today along the West Coast and into the Interior West will rise into the 70s for many by Thursday. Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$