Thursday's rain was a highly localized event. The highest impact was only felt over a 5-to-10 mile area south of Boston.

The agency predicted rain would fall at a rate of 1 to 2 inches per hour, potentially overwhelming small creeks and streams, streets, highways and underpasses, as well as other poor drainage and low-lying areas.

Communities south of Boston have seen as much as 4 and a half inches of rain, with a flash flood warning still in effect.