Lengthy Time With No Snowfall Prior to Monday

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
413 PM CST TUE NOV 13 2012 /513 PM EST TUE NOV 13 2012/

...LENGTHY TIME BETWEEN LAST AND FIRST SNOWFALLS IN 2012...

PARTS OF NORTHERN ILLINOIS SAW THEIR FIRST SNOWFALL OF THE SEASON
MONDAY EVENING...INCLUDING A TRACE OFFICIALLY MEASURED AT CHICAGO
OHARE INTERNATIONAL AIRPORT. THIS WAS TWO WEEKS BEHIND THE AVERAGE
FIRST TRACE OR GREATER OF SNOWFALL IN CHICAGO...WHICH IS OCTOBER
30TH.

THIS WAS THE FIRST SNOWFALL OF ANY AMOUNT SINCE MARCH 4TH.
BECAUSE OF THE RECORD WARMTH OF MARCH 2012 AND CONTINUED WARMTH
INTO APRIL...NO SNOW OCCURRED IN CHICAGO AFTER MARCH 4TH. THE SPAN
OF 252 DAYS WITHOUT SNOW FROM MARCH 4TH THROUGH MONDAY NOVEMBER
12TH WAS AN IMPRESSIVELY LONG STRETCH. THE THIRTY YEAR AVERAGE
BETWEEN LAST AND FIRST SNOWFALLS OF ANY AMOUNT IN CHICAGO IS 198
DAYS. IN THE PAST THIRTY YEARS...ONLY ONE SPRING-TO-AUTUMN PERIOD
WITHOUT SNOWFALL WAS LONGER THAN 2012 AND THAT WAS IN 1999. THAT
PERIOD WAS FROM MARCH 25TH TO DECEMBER 5TH...A STRETCH OF 254
DAYS. DECEMBER 5TH 1999 WAS THE LATEST FIRST TRACE OR MORE OF
SNOWFALL ON RECORD IN CHICAGO.

THERE IS CURRENTLY NO PRECIPITATION FORECAST FOR CHICAGO THROUGH
THE UPCOMING WEEKEND...SO THE FIRST MEASURABLE SNOWFALL OF 0.1
INCH OR GREATER OF THE SEASON WILL LIKELY NOT OCCUR THIS WEEK.
THE AVERAGE FIRST MEASURABLE SNOWFALL IN CHICAGO IS NOVEMBER
16TH...WHILE THE LATEST ON RECORD IS DECEMBER 16TH 1965.

$$

MTF


 



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