 To WTOP meteorologist Mike Steneford. Mike, looks like those warnings are getting a little stronger. Yeah, we've got a new severe thunderstorm warning for central Frederick County in Maryland until 4.30. Right now, radar showing a severe thunderstorm stretching from around Middletown to Braddock Heights, approaching Frederick on Interstate 70, moving east at 30 miles an hour. Watch out for winds up to 60 miles an hour. That'll be enough to bring down some trees and some power lines.