This post has been updated.

Strong thunderstorms passing through the Washington area are disrupting flights at Dulles International Airport, with Friday afternoon departures running up to 90 minutes. 

Air traffic is almost back to normal at Reagan National Airport, with delays lasting 15 minutes or less now.

Earlier in the day, delays of up to two hours were reported at Dulles and National.

Baltimore-Washington International Thurgood Marshall Airport is experiencing delays of less than 15 minutes.

Arrival traffic at all three airports is delayed 15 minutes or less, according to the Federal Aviation Administration air traffic control system.

The FAA is also reporting delays in other major airports in the Northeast, including Boston, New York and Philadelphia.

Airport officials encourage travelers to check with their airline to determine if their flight is affected.

The Capital Weather Gang is reporting storms in the Washington region capable of producing heavy downpours.  Follow the Capital Weather Gang’s live blog on this storm.