Northeast braces for flash flooding threat

The Northeast and Mid-Atlantic are bracing for a new round of severe storms and possible flash flooding on Tuesday after getting hammered by heavy rain on Saturday.

The greatest threat — a level 3 out of 5 risk — will span from northeastern Kentucky to New Jersey, including Pittsburgh, Washington, D.C., Baltimore and Philadelphia.

Numerous severe thunderstorms with potentially destructive winds and tornadoes are possible in this region.

Rounds of heavy rain and strong storms will move across the Ohio Valley through lunchtime and into the Northeast and mid-Atlantic through the afternoon and evening.

Flash flooding will be a concern for a large swath of the Interstate 95 corridor, from D.C. to Philadelphia to New York City.

Areas along the I-95 corridor may possibly get two rounds of storms — one midday, followed by the main one, moving through between about 5 p.m. to 8 p.m.

Flood watches have been issued for Tuesday, from Delaware to southern New York, where rainfall rates could exceed 1 inch per hour, potentially triggering flash flooding, especially in urban areas.

Philadelphia and New York City are expected to be included.

There is growing concern for slow-moving thunderstorms bringing torrential rain in some areas on Tuesday, possibly unfolding by the late morning or early afternoon.

The storms are expected to last throughout the day.

ABC News’ Melissa Griffin contributed to this report.