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The Federal Aviation Administration issued a notice saying flights out of Newark faced delays of more than two hours.
The agency closed the tunnel temporarily over the weekend to test the flood door as hurricane season picks up.
Over 200,000 ComEd customers were without power Tueday morning after at least 10 tornadoes were reported in the Chicago area Monday night — including twisters near both airports.
The city was under a severe thunderstorm watch, and a tornado warning was issued late Sunday and into early Monday. But that's not the last of the bad weather — another round storms is expected Monday evening.