Thunderstorms have, for a time, moved out of Philadelphia (which still has flight delays averaging 30 minutes) but continue in the NYC area with major flight delays at Newark, LaGuardia and JFK.
New thunderstorms — possibly severe — are forming over Pennsylvania and upstate New York. Those are moving east. So, the threat of more severe thunderstorms and flight delays will continue into this evening.
UPDATE: 4:37pm EDT: Severe thunderstorm watch issued,