Information on the 23 July 2011 Record Setting Rainfall at Chicago-O'Hare

6.86 INCHES OF RAINFALL HAVE BEEN RECORDED THROUGH 100 PM AT
CHICAGO-OHARE...WHICH ALREADY SHATTERED THE PREVIOUS ALL TIME
CALENDAR DAY RECORD RAINFALL TOTAL FOR THE CITY OF CHICAGO. OHARE
AIRPORT IS THE OFFICIAL CLIMATE SITE FOR THE CITY OF CHICAGO. THE
PERIOD OF RECORD BEGAN IN 1871. THE PREVIOUS CALENDAR DAY RAINFALL RECORD
WAS 6.64 INCHES ON SEPTEMBER 13TH 2008. INTERESTINGLY...THE
PREVIOUS CALENDAR DAY RECORD FOR JULY 23RD WAS SET ON JULY 23 2010
WITH 2.79 INCHES...ONLY TO BE BROKEN TODAY. THE RECORD EVENT
REPORT ISSUED AT 1100 AM WILL BE UPDATED AFTER 100 AM CDT TONIGHT
SHOULD ADDITIONAL RAINFALL OCCUR PRIOR TO THAT TIME.

8.20 INCHES OF RAINFALL OCCURRED BETWEEN 700 AM YESTERDAY AND 700
AM TODAY...WHICH FELL SHY OF THE ALL TIME 24 HOUR RAINFALL
RECORD...SET FROM AUGUST 13TH TO AUGUST 14TH 1987 WITH 9.35
INCHES. THE POTENTIAL DOES EXIST FOR ADDITIONAL HEAVY RAINFALL
LATER TONIGHT...SO THE 24 HOUR RAINFALL RECORD SET IN 1987 IS NOT
YET SAFE.

YET ANOTHER NOTABLE ASPECT OF THE TORRENTIAL RAINS OF THE LAST 2
DAYS IN NORTHEASTERN ILLINOIS HAS BEEN THE DRAMATIC SHIFT FROM THE
VERY DRY PATTERN THAT HAD EXISTED FOR MUCH OF JULY. ONLY 0.45
INCHES OF RAINFALL HAD BEEN RECORDED THROUGH JULY 21ST...WHICH WAS
1.85 INCHES BELOW THE NORMAL VALUE FOR THE MONTH.

WITH 8.86 INCHES OF RAIN FOR THE MONTH THROUGH 100 PM
TODAY...JULY 2011 HAS SURPASSED JULY 2010 TO MOVE INTO THIRD PLACE
AMONGST ALL TIME WETTEST JULYS. 8.84 INCHES FELL IN JULY 2010.
NUMBER 2 ON THE LIST IS JULY 1957 WITH 8.98 INCHES. THE ALL TIME
RAINIEST JULY OCCURRED ALL THE WAY BACK IN 1889 WITH 9.56 INCHES
OF RAINFALL. WITH A WEEK STILL LEFT IN JULY...IT IS REASONABLE TO
STATE THAT JULY 2011 COULD POTENTIALLY END UP AS THE WETTEST JULY
ON RECORD IN CHICAGO...PERHAPS AS SOON AS TONIGHT OR TOMORROW.
STAY TUNED.

$$

RC


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