Dangerous rainfall expected to impact major cities from Boston to D.C. before shifting to the Carolinas and Georgia with potential for tropical development.

Following a scorching heat wave, AccuWeather expert meteorologists are warning of a significant and dangerous flash flood threat across the eastern United States. More than 43 million people in the Northeast, spanning from New York City and Philadelphia to Baltimore and Washington, D.C., are at risk as a slow-moving front and a surge of moisture from the Gulf bring heavy rain to the region.

The risk of life-threatening flash flooding is particularly high around and after the evening commute on Thursday, July 31. Rainfall of 2-4 inches is expected in parts of the mid-Atlantic and New England, with a Local StormMax™ of 8 inches. AccuWe

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