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.

Massachusetts is expected to see what forecasters are deeming very heavy rainfall Thursday morning, prompting a flood watch to be issued for much of the state.

Forecasters say a few inches of rain could fall during a short time span, causing roads to get quickly flooded and rivers, streams and creeks to overflow.