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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.
Forecasters say 'torrential rains' are likely. Chicago is under a flood watch. The storm could drop 2 to 3 inches of rain and bring winds in excess of 58 mph. Another storm system could move through the region Monday evening.