One meteorologist said Chicagoans are "absolutely right" thinking the summer is cooler than normal.
One Wicker Park resident said he hasn't switched on his air conditioning unit all summer.
A storm could roll through city before 7:30 p.m., but it appears to be weakening as it hits Illinois.
An earlier tornado watch for several counties, including Cook County, had been canceled by 6 a.m.
A stormwater project is designed to reduce flooding in Dunning.
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