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

A "considerable" flash flood warning has been issued in Boston as heavy, life-threatening rain pounds the city and areas to the south. Two to 4 inches of rain has fallen so far. Rainfall rates are reaching up to 2 inches per hour.

Thursday will be a “storm sandwich” with pockets of heavy rain in the morning, a dry midday, and scattered afternoon showers and thunderstorms popping up across the region.