ChicagoTribune.com:  Those looking for some kind of break from the heat of the last week got it overnight - a rainstorm that dropped temperatures into the low 70s, but like the heatwave that preceded it, this rainstorm was anything but ordinary.  According to the ChicagoWeatherCenter.com, the total rainfall at O'Hare - 6.91 inches as of about 6:50 am - is the largest single day rainfall since records began in 1871.  The highest previous daily total was 6.64 inches on September 12, 2008, and ...
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