*HISTORICAL PERSPECTIVE ON STRETCHES OF 90 DEGREE PLUS WEATHER*


CHICAGO-O'HARE MAY FALL JUST SHY OF 90 DEGREES ON TUESDAY...BUT

ROCKFORD IS EXPECTED TO REACH THE LOWER 90S. HIGH TEMPERATURES ARE

THEN FORECAST TO REACH OR EXCEED 90 DEGREES AT ROCKFORD THROUGH

THIS UPCOMING SATURDAY...WHICH IF IT OCCURRED WOULD MEAN THAT

THERE WOULD HAVE BEEN 7 CONSECUTIVE DAYS OF 90 DEGREE OR HIGHER

TEMPERATURES. FOR CHICAGO...IF TEMPERATURES FAIL TO REACH 90 ON

TUESDAY...BUT THEN REACH OR EXCEED 90 THROUGH SATURDAY...THE

OFFICIAL LENGTH OF THE HEAT WAVE WILL HAVE BEEN 4 CONSECUTIVE

DAYS. HOWEVER...IT IS CERTAINLY POSSIBLE THAT TEMPERATURES REACH

90 ON TUESDAY...POTENTIALLY ALLOWING FOR A 7 DAY HEAT WAVE AT

CHICAGO AS WELL. HERE ARE THE LONGEST STRETCHES OF 90 DEGREE OR

HIGHER TEMPERATURES AT CHICAGO AND ROCKFORD.


...CHICAGO.

11 DAYS ON FOUR OCCASIONS...INCLUDING LAST DAY OF HEAT WAVE AND

YEAR.

...SEPTEMBER 3RD 1953

...JUNE 21ST 1954

...AUGUST 5TH 1955

...AUGUST 29TH 1959.


MOST RECENTLY...THERE WAS AN 8 DAY HEAT WAVE ENDING ON JUNE 30TH

2005 AND A 6 DAY HEAT WAVE ENDING ON AUGUST 2ND 2006.


...ROCKFORD.

AN INCREDIBLE 21 DAYS ON TWO OCCASIONS...INCLUDING LAST DAY OF

HEAT WAVE AND YEAR.

...JULY 18TH 1921

...AUGUST 1ST 1916.


MOST RECENTLY...THERE WAS A 7 DAY HEAT WAVE ENDING ON JUNE 29TH

2005 AND A 6 DAY HEAT WAVE ENDING ON JULY 19TH 2005.


*WARM OVERNIGHT LOW TEMPERATURES MEAN LITTLE RELIEF FROM THE HEAT*


WITH A VERY HUMID AIRMASS IN PLACE FOR THE REMAINDER OF THIS

WEEK...TEMPERATURES WILL NOT BE ABLE TO COOL MUCH AT NIGHT.

FORECAST LOW TEMPERATURES ARE IN THE MIDDLE AND UPPER 70S THROUGH

SATURDAY. ALTHOUGH RECORD HIGH TEMPERATURES ARE NOT EXPECTED

DURING THE CURRENT STRETCH OF HOT AND HUMID WEATHER...RECORD HIGH

MINIMUM TEMPERATURES ARE WELL WITHIN THE REALM OF POSSIBILITY AT

BOTH CHICAGO AND ROCKFORD. HERE IS A LIST OF THE RECORD HIGH

MINIMUM TEMPERATURES AT THE TWO SITES THROUGH JULY 24TH.


...............CHICAGO...............ROCKFORD

JULY 19TH......78 IN 1977............75 IN 1942

JULY 20TH......79 IN 1977............74 IN 1952, 1972 AND 1977

JULY 21ST......80 IN 1972............77 IN 1932, 1952 AND 2002

JULY 22ND......80 IN 1972............75 IN 1934, 1952 AND 1972

JULY 23RD......78 IN 1965............76 IN 1965

JULY 24TH......78 IN 1912**..........74 IN 1934 AND 1940


**TIED IN 1934, 1940 AND 2005


FOR JULY 18TH...THE LOW TEMPERATURE TODAY SO FAR AT CHICAGO WAS 80

DEGREES AT 504 AM CST. IF TEMPERATURES DO NOT FALL BELOW THIS MARK

BY 1200 AM CST (100 AM CDT)...A NEW RECORD HIGH MINIMUM

TEMPERATURE WILL BE SET FOR THE DATE. THE PREVIOUS RECORD WAS 78

DEGREES IN 1942.


AT ROCKFORD...THE LOW TEMPERATURE SO FAR TODAY WAS 79 DEGREES AT

556 AM CST...WHICH WOULD TIE THE RECORD FOR JULY 18TH SET IN 1942

IF TEMPERATURES DO NOT FALL BELOW THAT POINT BY 1200 AM CST (100

AM CDT).
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