Showers over northeastern Maryland will gradually taper off late Friday night, the National Weather Service tweeted.
Isolated to widely scattered showers are anticipated across the entire area overnight. Mild conditions are expected with areas of fog.
Severe thunderstorms popped up Friday afternoon along the Appalachians of Maryland, Virginia and West Virginia.
A severe thunderstorm watch was in effect across Western Maryland and into Frederick County until 10 p.m.
Allegany, Washington and Frederick counties were also under a flash flood watch through midnight. Quick downpours could drop an inch of rain, or possibly even a few inches, causing rapid flooding of streams and urban areas.
In the Baltimore region, chances for storms, or otherwise rain, are forecast into Saturday. Scattered showers and storms are possible during the day, with rain becoming more likely in the evening and into Sunday.
An inch or more of rain is expected in the Baltimore region from Friday through Sunday, with higher amounts expected to the west.
Sunshine is forecast Monday and for the early part of next week.