Barely has Baltimore dried out from Hurricane Irene when the region was put on a flash flood watch through Tuesday evening.

Motorists on the road Monday night were urged to drive cautiously, as a line of thunderstorms capable of producing heavy rains and flash flooding was expected to move through the area from Pikesville to about 11 miles southwest of Columbia.

The National Weather Service issued a flash flood warning through 2:15 a.m. Tuesday for northwestern Baltimore City, central Baltimore County, Howard County and south-central Carroll County.

Up to two inches of rain have already fallen today on some parts of the state, and the National Weather Service announced that an additional inch or two are possible.

Motorists are warned to be especially careful in low-lying areas near highway underpasses, creek beds and drainage areas.

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