Thunderstorms ground flights across Northeast; BWI tower struck by lightning

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Thunderstorms grounded planes at airports across the Northeast Thursday, causing travel delays.

Lightning struck a tower at Baltimore Washington International Airport, the Federal Aviation Administration said.

Ground stops were in effect for airports in Boston, Baltimore, Washington, Newark, New York and Philadelphia, according to the FAA.

The FAA reported departure delays of 1½ hours at Boston Logan International Airport, two hours at New York’s LaGuardia Airport, one hour at Ronald Reagan Washington National Airport and 45 minutes at New York’s JFK International Airport.