Hundreds of flights were canceled July 14-15, 2025, at airports in New York, Washington and Boston, according to airline tracking company FlightAware. (Credit: Bloomberg)

(Bloomberg) — Airports in the Northeast are suffering significant cancellations after torrential downpours unleashed flash flooding around New York City Monday night when slow-moving thunderstorms rolled through the region.

As of the morning of Tues., July 15, 2025, 377 flights were canceled at airports in New York, Washington and Boston, according to airline tracking company FlightAware. Newark Liberty International Airport in New Jersey was most impacted with 13% of flights canceled, while New York’s LaGuardia airport suffered a 6% cancellation rate. John F. Kennedy International Airport saw 2% of flights scrapped.

New York City’s morning commute is returning to normal after multiple stations were inundated Monday night, forcing the Metropolitan Transportation Authority to suspend or severely delay operations across several lines.

Numerous flash floods had been reported across New York, New Jersey and Connecticut, closing roads and highways, submerging cars, and stranding motorists, according to the National Weather Service. Metro-North reported suspensions of service on part of the Harlem line, and some delays on the New Haven line, as well, which has since been reopened.

New York’s Central Park had 2.64 inches (6.7 centimeters) of rain Monday, an all-time high for July 14, the US National Weather Service said. New highs for the date were also set at New Jersey airfields, with Newark getting 2.13 inches and Teeterboro Airport having 2.25 inches. New York’s LaGuardia experienced a record 1.66 inches.

A large slug of moisture blanketed the US East Coast, from Florida to Maine, and a slight dip in the low-level jet stream touched off widespread thunderstorms. To make matters worse, there wasn’t a lot of wind to push the storms along so they lingered through Monday afternoon and into the evening, elevating the flood risk. New Jersey Governor Phil Murphy had declared a state of emergency Monday night due to flash flooding and heavy rainfall, according to a post on X.

I am declaring a State of Emergency given flash flooding and high levels of rainfall in parts of the state.
Please stay indoors and avoid unnecessary travel. Stay safe, New Jersey.
— Governor Phil Murphy (@GovMurphy) July 14, 2025

Flood watches remain in effect for parts of Maryland and Virginia through Tuesday morning.

New York now has to contend with heat, with temperatures set to reach 87F (30.5C) Tuesday and rise into the 90s from Wednesday to Friday. With humidity, readings may feel closer to 95F or even 100F across the city and the region.

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