Public Information Statement
Issued by NWS Chicago, IL

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060230-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
927 PM CDT MON APR 4 2016 /1027 PM EDT MON APR 4 2016/

...RECENT SHARP DAY-TO-DAY TEMPERATURE CHANGES ARE QUITE RARE...

TEMPERATURES VARIED SIGNIFICANTLY FROM ONE DAY TO THE NEXT ACROSS
MOST OF NORTHERN ILLINOIS AND NORTHWEST INDIANA DURING THE THREE
DAY STRETCH FROM SATURDAY APRIL 2 THROUGH MONDAY APRIL 4. CHICAGO
AND ROCKFORD BOTH SAW A 30 DEGREE PLUS WARM UP FROM APRIL 2 TO
APRIL 3...AND THEN A 30 DEGREE PLUS COOL DOWN FROM APRIL 3 TO
APRIL 4. WHILE WE EXPECT SOME DRASTIC WARM UPS AND COOL DOWNS IN
THE MIDWEST...THIS RAPID SUCCESSION OF BOTH IS EXCEPTIONALLY RARE.

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ROCKFORD

                   HIGH   DIFFERENCE FROM PREVIOUS DAY
SAT APRIL 2 2016    41
SUN APRIL 3 2016    75              +34
MON APRIL 4 2016    42              -33

THERE HAS ONLY BEEN ONE OTHER INSTANCE DATING BACK TO 1905 WITH
A 30 DEGREE PLUS TEMPERATURE CHANGE IN BACK-TO-BACK-TO-BACK DAYS.
THAT WAS DURING FEBRUARY 2-4 1970. HERE IS A LOOK AT THE HIGHS
DURING THAT STRETCH:

                   HIGH   DIFFERENCE FROM PREVIOUS DAY
FEBRUARY 2 1970     36
FEBRUARY 3 1970     -3              -39
FEBRUARY 4 1970     32              +35

THERE HAVE BEEN SOME OTHER CLOSE INSTANCES SUCH AS JANUARY 18-20
1996 WHICH SAW HIGHS OF 57...7...AND 20 IN THREE CONSECUTIVE DAYS.
ALSO APRIL 1-3 1978 HAD HIGHS OF 64...36...AND 69.


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CHICAGO

                   HIGH   DIFFERENCE FROM PREVIOUS DAY
SAT APRIL 2 2016    40
SUN APRIL 3 2016    71              +31
MON APRIL 4 2016    38              -33

SINCE 1871 THERE HAVE ONLY BEEN THREE OTHER INSTANCES WITH A 30
DEGREE PLUS TEMPERATURE CHANGE IN BACK-TO-BACK-TO-BACK DAYS. HERE
ARE THOSE STRETCHES:

                   HIGH   DIFFERENCE FROM PREVIOUS DAY
FEBRUARY 3 1875     45
FEBRUARY 4 1875      5              -40
FEBRUARY 5 1875     35              +30

                  *HIGH   DIFFERENCE FROM PREVIOUS DAY
MARCH 27 1895       73
MARCH 28 1895       32              -41
MARCH 29 1895       80              +48

                   HIGH   DIFFERENCE FROM PREVIOUS DAY
FEBRUARY 2 1970     40
FEBRUARY 3 1970      2              -38
FEBRUARY 4 1970     36              +34

* = SOME OF THIS DATA FOR MARCH 1895 MAY HAVE ERRORS.

ONLY THE FINAL OCCURRENCE WAS DURING THE PERIOD WHEN THE OFFICIAL
CHICAGO OBSERVING SITE WAS NOT LOCATED IN DOWNTOWN CHICAGO. FROM
1942 TO 1980 THE OFFICIAL MEASUREMENTS WERE AT CHICAGO MIDWAY
INTERNATIONAL AIRPORT...AND FROM 1980 TO PRESENT IT HAS BEEN AT
CHICAGO OHARE INTERNATIONAL AIRPORT.

$$

MTF



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