Additional Heat Wave Information

*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).

$$

RC


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