032 FXUS01 KWBC 030629 PMDSPD Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 228 AM EDT Sun May 03 2026 Valid 12Z Sun May 03 2026 - 12Z Tue May 05 2026 ...Heavy rain threat persists for central and southern Florida into early next week as a frontal boundary sags southward... ...A cold front is set to form and move through the Plains, bringing widespread precipitation through the middle of the week... ...Chilly temperatures remain for the Ohio Valley and Mid-Atlantic Sunday night, while unseasonable warmth continues in the Northwest... The frontal boundary that brought unsettled weather to the Southeast on Saturday will continue its slow southward progression across the Florida Peninsula today. Anomalous moisture pooling along the front, combined with increasing afternoon instability, will continue to support scattered to numerous clusters of showers and thunderstorms. Due to the slow movement of the front and localized effects in the form of sea breezes, persistent rainfall is expected. Storm coverage is expected to wane after Monday as the front loses some of its upper-level support. Across the Western U.S., a slow-moving upper-level trough associated with a Pacific low will begin to progress inland across California and the Southwest on Monday and Tuesday. Increasing moisture and instability ahead of this system will support scattered low-elevation showers and thunderstorms across northern California and parts of the Central Great Basin, as well as high-elevation mountain snow showers, particularly in the Sierra Nevada. Temperatures are expected to trend significantly cooler for the first half of the work week as cloud cover and precipitation expand through the region. Meanwhile, the Pacific Northwest will experience well-above-average temperatures over the next few days. Parts of Washington and Oregon could see highs approaching and potentially exceeding 90 degrees today. In the eastern half of the country, multiple disturbances rotating around a large upper-level low over southeast Canada will continue to push reinforcing cold fronts into the Great Lakes, Ohio Valley, and Northeast through Tuesday. These systems will keep temperatures near to below seasonal averages and maintain chances for scattered showers. With these colder temperatures, frost and freeze concerns are possible for portions of the Ohio Valley, Mid-Atlantic, and central Appalachians Sunday night into Monday morning. Meanwhile, a southern-stream mid-level shortwave over the Southwest will begin merging with troughing over the Plains, resulting in an expansive cold front moving southward into the Southern Plains by Tuesday morning. The associated surface low will bring renewed precipitation chances, in the form of showers and thunderstorms, throughout a large portion of the Northern and Central Plains on Monday afternoon and evening. Snow and mixed precipitation will also be possible for the high-elevation regions of the Northern Plains and Rockies. By Tuesday, the front is forecast to continue its southeastward progression and will bring showers and thunderstorms to the Midwest, Mississippi and Ohio Valleys, and portions of the Northeast. Gusty northwesterly winds are then expected to commence in the Northern Plains. With additional low relative humidity expected (below 30%), an Elevated Risk of fire weather is expected for this area today and Monday. Blanco-Alcala Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php $$