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Public Information Statement
Issued by NWS Chicago, IL
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NOUS43 KLOT 130948
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ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
132200-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
448 AM CDT MON MAY 13 2013 /548 AM EDT MON MAY 13 2013/

...DRAMATIC AND UNUSUALLY LARGE WARM UP EXPECTED EARLY THIS WEEK...

LOW TEMPERATURES THIS MORNING FOR CHICAGO AND ROCKFORD WILL LIKELY
BOTTOM OUT OFFICIALLY IN THE LOWER OR MIDDLE 30S. A STRONG WARM
FRONT WILL SURGE THROUGH THE AREA TONIGHT SENDING TEMPERATURES SKY
ROCKETING ON TUESDAY. FORECAST HIGHS FOR TUESDAY IN THE MID TO
UPPER 80S WOULD RESULT IN A 1 DAY WARM UP IN EXCESS OF 50 DEGREES!
A LOOK BACK THROUGH CLIMATOLOGICAL RECORDS REVEALS THAT A WARM-UP
THIS DRAMATIC IS QUITE RARE...ESPECIALLY IN MAY. HERE IS A LOOK AT
THE LARGEST SINGLE DAY WARM UP EVER IN ROCKFORD AND CHICAGO AND
THE LARGEST FOR MAY. THIS WAS CALCULATED BY TAKING THE DIFFERENCE
BETWEEN THE DAY`S HIGH TEMPERATURE AND THE PREVIOUS CALENDAR DAY`S
LOW TEMPERATURE...

HERE ARE THE ALL TIME LARGEST ONE DAY WARM UPS...

                  CHICAGO
   DIFF    LOW     DATE         HIGH     DATE
1)  58      0    02/13/1887      58    02/14/1887
    58      15   03/11/1972      73    03/12/1972
3)  57      24   03/31/2003      81    04/01/2003
4)  56      29   04/09/1977      85    04/10/1977
    56      25   04/23/1986      81    04/24/1986
    56      29   04/13/2003      85    04/14/2003
7)  54      12   03/31/1969      66    04/01/1969
    54      28   04/25/1983      82    04/26/1983
9)  53      37   04/09/1930      90    04/10/1930
    53      44   06/03/1977      97    06/04/1977

                  ROCKFORD
   DIFF    LOW     DATE         HIGH     DATE
1)  63      30   04/09/1930      93    04/10/1930
2)  59     -17   02/22/1936      42    02/23/1936
    59      11   03/17/1976      70    03/18/1976
4)  58      -6   01/29/1926      52    01/30/1926
5)  57     -21   01/21/1924      36    01/22/1924
    57      24   03/31/2003      81    04/01/2003
7)  56      16   11/04/1945      72    11/05/1945
    56      27   04/21/1953      83    04/22/1953
    56      24   04/10/1996      80    04/11/1996
    56      29   04/13/2003      85    04/14/2003


HERE ARE THE TOP 5 LARGEST ONE DAY WARM UPS DURING THE MONTH OF
MAY...

                  CHICAGO
   DIFF    LOW     DATE         HIGH     DATE
1)  50      38   04/30/1992      88    05/01/1992
2)  49      36   05/16/1984      85    05/17/1984
3)  48      43   05/01/1959      91    05/02/1959
    48      41   05/26/1969      89    05/27/1969
5)  47      41   05/27/1895      88    05/28/1895


                  ROCKFORD
   DIFF    LOW     DATE         HIGH     DATE
1)  53      31   05/15/1926      84    05/16/1926
    53      53   05/30/1934     106    05/31/1934
3)  51      32   05/04/1926      83    05/05/1926
    51      35   05/18/1955      86    05/19/1955

THERE WERE NUMEROUS INSTANCES OF 50 DEGREE WARM UPS DURING THE
MONTH OF MAY IN ROCKFORD...SO ONLY THE TOP 4 ARE LISTED. ALSO...IT
IS WORTH NOTING THAT IT IS POSSIBLE THAT THE OBSERVATION TIME MAY
HAVE CHANGED WITH SOME OF THE VERY OLD RECORDS WHICH COULD RESULT
IN UNEQUAL COMPARISONS. FOR INSTANCE...IF THE OBSERVATION TIME WAS
AT 1200 UTC...THEN LOW TEMPERATURES COULD HAVE BEEN FOR THE
PREVIOUS MORNING RESULTING IN WHAT MIGHT HAVE ACTUALLY BEEN A 2
DAY WARM UP. DESPITE ANY POSSIBLE DISCREPANCY IN THE OBSERVATION
TIME THE VALUES ABOVE SHOULD PROVIDE A FAIRLY GOOD REPRESENTATION
OF JUST HOW EXTRAORDINARY AND UNUSUAL THE FORECASTED WARM UP IS
FROM TODAY TO TOMORROW.

$$

IZZI
National Weather Service Weather Forecast Office
