Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 352 AM EDT Tue May 27 2025 Valid 12Z Tue May 27 2025 - 12Z Thu May 29 2025 ...There is a Slight Risk of excessive rainfall over parts of the Southern Plains, the Lower Mississippi/Tennessee Valleys/Southeast/southern Mid-Atlantic, and Ohio Valley/Central Appalachians on Tuesday... ...There is a Slight Risk of severe thunderstorms over parts of the Southern Plains and Lower Mississippi Valley/Southeast on Tuesday and the Southern High Plains on Wednesday... A wave of low pressure over the Tennessee Valley will move to the Lower Great Lakes by Thursday. One more day of moisture will flow northward out of the Gulf of America and overrun the boundary, creating showers and thunderstorms with heavy rain over parts of the Southern Plains. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Southern Plains through Wednesday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas the most vulnerable. Furthermore, severe thunderstorms will develop over parts of the Southern Plains. Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Southern Plains through Wednesday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. However, there is an increased risk of hail, two inches or greater, over the region. Moreover, a second area of heavy rain will develop over parts of the Lower Mississippi Valley to the Southeast and southern Mid-Atlantic. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Lower Mississippi Valley to the Southeast and southern Mid-Atlantic through Wednesday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas the most vulnerable. Similarly, there will be a second area of severe thunderstorms over parts of the Lower Mississippi Valley to the Southeast. Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Lower Mississippi Valley to the Southeast through Wednesday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Furthermore, a third area of heavy rain will develop over parts of the Ohio Valley/Central Appalachians. Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Ohio Valley/Central Appalachians through Wednesday morning. The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas the most vulnerable. In addition, rain and showers will develop over parts of the Upper Midwest and the Mid-Atlantic on Tuesday. During the late afternoon and early evening, upper-level energy will create scattered showers and thunderstorms over the Central/Southern Rockies. On Wednesday, the wave of low pressure moves into the Lower Great Lakes, developing showers and thunderstorms over the Ohio/Tennessee Valleys and the Mid-Atlantic. Furthermore, upper-level energy will aid in producing showers and thunderstorms over parts of the Central/Southern Rockies and Upper Midwest during the late afternoon and early evening. Overnight Wednesday, rain will develop over parts of the Northeast. A second wave of low pressure will also move southeastward out of the Texas Panhandle to the Central Gulf Coast by Thursday morning. The system will produce showers and severe thunderstorms over Southern High Plains. Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over the Southern High Plains from Wednesday through Thursday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. Meanwhile, a front over the Pacific will move near the Pacific Northwest by Thursday morning, producing scattered rain over parts of the Northwest. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php