Heavy rain is forecast to cross Maryland late Thursday, and could cause flash flooding north and west of Baltimore.
The National Weather Service issued a flash flood watch across Carroll, northern Baltimore and northern Harford counties until midnight. That means conditions could be ripe for heavy downpours that create fast-rising and fast-moving floods.
A cold front is approaching the region from the Great Lakes, ushering in seasonably cooler temperatures for the weekend. But first, it is forecast to wring heavy rain from the humid air over the region.
Rain and storms are forecast to continue Friday morning.
Sunshine and highs in the lower 80s are forecast for the weekend.