Overnight rains that approached 7 inches over northern Cook County broke several impressive Chicago records. 6.91" of precipitation has been measured at O'Hare International Airport since Midnight making today, Chicago's wettest calendar day in modern weather history.
Chicago's top 3 wettest calendar days
1) 6.91" today
2) 6.64" September 13, 2008
3) 6.49" August 14, 1987
And we aren't done yet. Off and on showers and thunderstorms are expected to continue this morning before ending this afternoon. While heavy downpours will be possible this morning, the rain is not expected to be as heavy as last night's.
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