Airports ground flights across the Eastern U.S. because of the severe weather threat.

Airports across the Eastern United States grounded numerous flights because of the threat of severe weather on Monday afternoon, leading to dozens of flight delays and cancellations into the evening.

The Federal Aviation Administration issued the temporary ground stops on Monday afternoon for a busy travel corridor linking major U.S. cities that included Baltimore/Washington International Airport, Hartsfield-Jackson Atlanta International Airport, Reagan Washington National Airport, Newark Liberty International Airport, Dulles International Airport and Philadelphia International Airport, as well as La Guardia Airport and Kennedy International Airport in New York.

Dozens of flights were delayed or canceled at the airports where ground stops were in place, causing a ripple effect of delays across the country, according to FlightAware, a website that tracks flight information.

The F.A.A. said in a post on social media that it was “rerouting aircraft around the storms heading to the East Coast as much as possible.”

Hartsfield-Jackson Atlanta International Airport in Atlanta had more than 122 canceled flights and delayed more than 300, making it the airport that was most affected by the severe weather threat as of Monday afternoon, according to FlightAware. Reagan Airport in Arlington, Va., followed closely, with more than 80 canceled flights and more than 80 delays, according to FlightAware.