A risk of flash flooding will reach from the Gulf Coast to the Tennessee Valley on Friday, while enough downpours farther to the north and east can foil outdoor plans into Saturday.
A slow-moving storm producing severe weather over the Plains through Thursday will shift farther east later this week. While the storm will transition away from severe weather, it can still cause some problems.
A general 0.50 to 1.00 inch of rain will fall from a mosaic of showers and thunderstorms that drifts slowly to the east Friday and Saturday over the Central and Eastern states. In a few locations where downpours repeat, there can be several inches of rain and flash flooding.
Friday will be the wetter of the two days from coastal Texas and Arkansas to Ohio, Indiana, Michigan and upstate New York.
Folks traveling along the I-40, I-55, I-64 and I-65 corridors should be prepared for sudden low visibility and excess water on the roadway. Flight delays are possible from locally strong thunderstorms in Detroit, Indianapolis, Cincinnati, Memphis and Houston.
Saturday will be the more unsettled of the two days from Alabama to New Jersey, southeastern New York state and southeastern New England.
Motorists should be prepared for slow travel along the I-59 and I-81 corridors, as well as a portion of I-80 and I-95. Downpours can cause some minor flight delays in New York City, Philadelphia, Washington, D.C., Pittsburgh, Atlanta and New Orleans.
From southeastern Louisiana to much of Pennsylvania, both days have the potential for disruptive downpours.
Outdoor activities ranging from graduation and weddings to baseball games and travel could be impact by the drenching downpours.
There is some good news for moms out there at least from the central Appalachians and mid-Atlantic to New England. Enough dry air should mix in to keep rain away from these areas on Sunday, Mother's Day. Only very spotty downpours are likely from the Southeastern states to the Midwest.
However, a new storm will already be moving across the Northwest on Saturday. That storm is likely to bring everything from severe thunderstorms and heavy rain to cold winds and snow from parts of the Rockies to the Great Plains starting on Sunday.