HEAT INDEX VALUES COULD REACH 105 DEGREES IN CHICAGO TODAY AND
AGAIN WEDNESDAY AND THURSDAY THIS WEEK. LOOKING BACK AT THE PERIOD
1990 THROUGH 2010 IT TURNS OUT THAT DAYS THAT SAW THE HEAT INDEX
IN CHICAGO OFFICIALLY REACH 105 DEGREES WERE QUITE RARE. IN
FACT...THERE HAVE ONLY BEEN 31 DAYS WHERE THE HEAT INDEX
OFFICIALLY REACH 105 DEGREES AT OHARE INTERNATIONAL AIRPORT...THE
OFFICIAL RECORDING STATION FOR CHICAGO. IN FACT...IN ORDER TO FIND
THE LAST HOURLY OBSERVATION WITH A HEAT INDEX OF AT LEAST 105 IN
CHICAGO ONE WOULD HAVE TO LOOK BACK TO 6 PM ON AUGUST 2ND 2006.