Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 346 PM EDT Tue Aug 26 2025 Valid 00Z Wed Aug 27 2025 - 00Z Fri Aug 29 2025 ...Scattered areas of flash flooding remain possible across pockets of the Intermountain West through Wednesday... ...Rounds of heavy rainfall are anticipated across portions of Colorado, New Mexico, Kansas, Oklahoma, into the Mid-South through Thursday... ...Temperatures are expected to trend cooler, however above-normal temperatures will persist across the Northwest; below-average temperatures expected for much of the remaining contiguous U.S..... Fueled by monsoonal moisture, showers and thunderstorms will persist into this evening across parts of the Southwest, Great Basin, Sierra Nevada, and central and southern Rockies. Flash flooding remains a concern, particularly in dry washes, arroyos, urban areas, burn scars, and box canyons. On Wednesday, storms are expected to be more isolated in the Southwest, Great Basin, and Sierra Nevada. However, an upper-level disturbance will bring more widespread activity and a higher risk of heavy rain and flash flooding across the northern Intermountain West and northern Rockies. Temperatures will stay above normal through midweek, but the upper-level system and increased cloud cover will help alleviate the ongoing heatwave in the Northwest and northern Intermountain West. A series of disturbances from the western U.S. will interact with moisture spreading through the southern Plains, producing storms over the central Rockies and High Plains. These storms will spread east into Kansas and Oklahoma by Wednesday morning, reaching the Ozarks by the afternoon and evening. However, redeveloping storms are likely back to the west, resulting in an increasing chance for heavy rainfall accumulations and flash flooding from the Colorado High Plains eastward across Kansas and northern Oklahoma into the Ozarks, Wednesday though Wednesday night. Then on Thursday, the greater threat for heavy rain and flash flooding will shift a little farther south over the High Plains, extending from eastern Colorado into northeastern New Mexico. Farther to the east, while an isolated chance for flash flooding will remain across the central and southern Plains, a greater threat will focus farther east from the Ozarks into parts of the Mid-South and the lower Mississippi Valley. Apart from the Northwest and the Gulf Coast states, daytime temperatures are expected to be seasonal to below average across much of the contiguous U.S. Forecast to dip more than 15 degrees below average in some spots, records lows are expected across parts of the Ohio/Tennessee valleys and the Mid-South tonight, with additional records possible across parts of the Ohio Valley, Mid Atlantic, and Northeast Wednesday night. Pereira Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php