Over 1,000 flights canceled as I-95 corridor braces for new flood threat

The Northeast and Mid-Atlantic are bracing for another round of severe storms and possible flash flooding on Tuesday after being battered by heavy rain on Saturday.

The greatest threat (level 3 risk out of 5) will extend from northeastern Kentucky to New Jersey, including Pittsburgh, Washington, DC, Baltimore and Philadelphia.

Multiple severe storms with potentially destructive winds and tornadoes are possible in this region.

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Heavy rain and strong storms will move across the Ohio Valley around lunchtime and into the Northeast and Mid-Atlantic during the afternoon and evening.

Areas along the Interstate 95 corridor are likely to experience two rounds of storms – one around noon, followed by a larger storm between 5 and 8 p.m.

Flash flooding will be a concern for a large swath of the I-95 corridor from DC to Philadelphia to New York City.

Flood watches have been issued from Delaware to southern New York, where rainfall rates could exceed 1 inch per hour and trigger flash flooding, especially in urban areas. Philadelphia and New York City are also expected to be included.

More than 1,400 flights were canceled ahead of the storms on Tuesday, with the biggest impacts seen at airports in New York City and Washington, D.C.

New York City Mayor Zohran Mamdani urged New Yorkers to “be careful” on Tuesday.

“If there is thunder, heavy rain or strong winds, get inside,” he said on social media. “If you live in a basement, know your exits and be prepared to move to the next floor if it starts to rain heavily.”

Tuesday’s expected flooding comes just days after New York City was inundated by heavy rain that submerged streets on Saturday.

ABC News’ Melissa Griffin contributed to this report.