Posted June 19, 2018 9:56 p.m. EDT
Some sunshine and low humidity will linger Wednesday across much of New England, while a mass of cool air settles over the coastal Mid-Atlantic. A storm from the Midwest will bring clouds, showers and thunderstorms to the central Appalachians early in the day. The rain will eventually shift to the coast.
Hazy, hot and humid conditions are expected to persist across much of the Southeast. Very spotty storms will develop in the afternoon.
An influx of tropical moisture will bring drenching showers and strong thunderstorms from coastal and central Texas north to much of Montana and east to Kentucky, Ohio and West Virginia. Enough rain may quickly fall to cause flash flooding in spots. Parts of Texas and Louisiana can also expect small-stream, bayou and river flooding. A few storms over the central states and in Virginia may become severe in the afternoon.
Most of the West will be dry and sunny. As a weak storm system brings cool air to the region, strong thunderstorms may develop in the afternoon over parts of Oregon and Washington.
FOCUS: Severe Thunderstorms Later Thursday
Thunderstorms are expected to develop across parts of the central Mississippi Valley on Thursday afternoon. The storms may turn severe, with damaging winds and hail from south-central Illinois to eastern Arkansas.