Heavy downpours, flash floods disrupt travel along U.S. Eastern Seaboard

New York Governor Kathy Hochul and her acting New Jersey counterpart declared state of emergency for areas facing the threat of flash floods on Thursday (July 31, 2025) from heavy downpours disrupting rail and air travel along the Eastern Seaboard.

The National Weather Service posted flash flood warnings along parts of the Northeast urban corridor stretching from the Washington-Baltimore region north through Philadelphia, Wilmington, Delaware, and into Newark, New Jersey, and the New York City metropolitan area.

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Severe thunderstorm watches were also in effect across much of the Interstate-95 corridor, but forecasters said flash flood risks were starting to fade Thursday night (July 31, 2025.) Stormy weather during the day appeared to be a key factor disrupting commercial air travel across the Northeast.

The eight major airports serving the region — Washington Dulles, Baltimore-Washington, Ronald Reagan Washington National, Philadelphia, Newark Liberty, LaGuardia, John F. Kennedy International and Boston Logan — accounted for the cancellation of at least 1,170 flights into, out of or within the U.S., according to online flight tracking service FlightAware. Hundreds of flights were delayed.

Passenger rail travel was also hampered, with Amtrak reporting service suspended between Philadelphia and Wilmington owing to severe storms flooding the tracks. Service was restored about two hours later as water receded, but “residual delays” were expected, Amtrak said on X.

A daily rainfall outlook map issued by the Weather Prediction Centre put the risk of “excessive” showers capable of triggering flash floods at 40% or higher for a swath of the mid-Atlantic and Northeast that is home to 37 million people.

Up to 5 inches (12.7 cm) of rain was forecast in the heaviest bands of showers across New York City, Long Island and the Hudson River Valley, with rainfall rates that could exceed two inches per hour, according to a statement from Ms. Hochul.

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“I am urging all New Yorkers to stay vigilant, stay informed, and use caution as we expect excessive rainfall with the potential for flash flooding,” Ms. Hochul said.

New Jersey was bracing for rainfall totals of 1 to 3 inches generally, with localised downpours that could produce 5 to 7 inches, acting New Jersey Governor Tahesha Way said in her declaration.

“Residents should remain off the roads and indoors unless absolutely necessary,” Ms. Way, the Lieutenant Governor,” said in a statement. She is temporarily serving as the state’s chief executive while Governor Phil Murphy was out of the state on vacation with his family.

The Weather Service attributed the storm threat to a cold front that was bringing a combination of unstable air mass and exceptional amounts of atmospheric moisture to the region.