Severe thunderstorms on the East Coast have resulted in flight cancellations and significant delays for passengers.

According to FlightAware, a total of 811 flights were canceled on Monday. Among them, 517 flights were scheduled to depart from, arrive at or travel within the United States. Over 7,000 flights experienced frustrating delays with 683 of them being domestic flights.

The National Weather Service issued a severe thunderstorm warning for the Mid-Atlantic states on Monday. It alerted residents and travelers to potentially dangerous conditions. The National Weather Service Storm Prediction Center stated that “severe thunderstorms” are moving across the Mid-Atlantic states.

Poor weather conditions on Sunday wreaked havoc on the airline industry, causing the cancellation and delay of numerous flights. According to FlightAware, a staggering total of 1,378 flights were canceled within the United States on that day. An additional 9,231 flights are experiencing frustrating delays.

Major East Coast Airports

The impact of the storms continued on Monday. More than 100 flights were canceled at Newark Liberty International Airport and 97 flights were canceled at LaGuardia Airport.

Major airports struggled to maintain normal operations. The storms caused flight cancellations throughout the region, according to the Federal Aviation Administration.

Flights to and from airports in the Washington, D.C., area were halted on Sunday, due to an issue at an air traffic control center.

“The FAA has paused departures to D.C.-area airports while repairs are made to a communications system at the Potomac Terminal Radar Approach Control facility,” the FAA informed the public on Twitter. “To ensure safety, the facility has switched to a backup system.”

Approximately an hour later, the FAA announced the resumption of operations at Reagan and Dulles International Airports, bringing a sigh of relief to affected travelers.