"I have declared a State of Emergency out of an abundance of caution due to flash flooding and severe thunderstorms across the state," said Gov. Murphy.

Dozens of flash flood warnings are in effect for millions across several states and major cities in the Northeast, as slow-moving summer storms impact the East Coast Monday evening.

Dangerous and destructive flash flooding and rises on area rivers are anticipated as inches of rain pour down from midweek to this weekend, with the apex likely to be in Louisiana and western Mississ...