The National Weather Service Reports:

Flash Flood Watch

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 10 PM EDT THIS EVENING THROUGH LATE WEDNESDAY NIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF MARYLAND...THE DISTRICT OF COLUMBIA AND VIRGINIA... INCLUDING THE FOLLOWING AREAS...IN MARYLAND...ANNE ARUNDEL... CALVERT...CARROLL...CHARLES...HARFORD...HOWARD...MONTGOMERY...