Tranquil Severe Weather Season Thus Far

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
542 AM CDT TUE JUN 19 2012 /642 AM EDT TUE JUN 19 2012/

...TRANQUIL SEVERE WEATHER SEASON THUS FAR...

THE SPRING AND THUS FAR THIS METEOROLOGICAL SUMMER HAVE BEEN
DRY...AND WITH THAT HAS ALSO COME A WELL BELOW NORMAL SEVERE
WEATHER SEASON. THE JET STREAM HAS REMAINED PRIMARILY TO THE WEST
AND NORTH OF THE AREA...AND RICH LOW-LEVEL MOISTURE HAS BEEN SCARCE
FOR ANY EXTENDED PERIOD OF TIME. THESE ARE TWO CRITICAL FACTORS IN
WIND SHEAR AND INSTABILITY RESPECTIVELY WHICH CONTRIBUTE TO SEVERE
STORM ENVIRONMENTS. IN ADDITION...THE VERY WARM SPRING OFTEN
PROVIDED SCENARIOS WHERE THE ATMOSPHERE WAS CAPPED...NOT ALLOWING
FOR THE DEVELOPMENT OF THUNDERSTORMS.

FOLLOWING ARE STATISTICS ON THE QUIET SEVERE WEATHER SEASON THUS
FAR FOR THE NWS CHICAGO COUNTY WARNING AREA...WHICH ENCOMPASSES 23
COUNTIES ACROSS NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST
INDIANA.


.NUMBER OF SEVERE WEATHER REPORTS THROUGH JUNE 19TH...

                  2012     2008-2011 AVERAGE
---------------------------------------------
WIND AND HAIL       63*         152
TORNADOES            1*          11

* = THESE NUMBERS ARE CONSIDERED PRELIMINARY.


.NUMBER OF SEVERE WEATHER WARNINGS ISSUED BY NWS CHICAGO THROUGH
JUNE 19TH...

                         2012     2008-2011 AVERAGE
---------------------------------------------------
SEVERE THUNDERSTORM       44            77
TORNADO                    4            13


NOTE ALL THE AVERAGES ABOVE ARE ALSO THROUGH JUNE 19TH.


IT MAY BE THOUGHT THAT NORTHERN ILLINOIS AND NORTHWEST INDIANA
HAVE MORE SEVERE WEATHER THAN AREAS WELL TO THE NORTH...SUCH AS
NORTHERN MINNESOTA AND NORTHERN WISCONSIN. THIS HAS NOT BEEN THE
CASE THIS YEAR...SHOWING HOW THE JET STREAM LOCATION AND ASSOCIATED
STORM TRACK IS CRITICAL IN WHERE SEVERE WEATHER WILL DEVELOP. BELOW
IS A COMPARISON OF SEVERE THUNDERSTORM WARNINGS BETWEEN NWS CHICAGO
AND THE OFFICES THAT HAVE WARNING RESPONSIBILITIES FOR THOSE NORTHERN
LOCATIONS. WHILE THE WARNING AREAS ARE OF DIFFERENT SIZES...THE
NUMBERS STILL REFLECT THAT THE FAR UPPER MIDWEST HAS SURPRISINGLY
SEEN MORE PERSISTENT AND FAVORABLE SEVERE WEATHER ENVIRONMENTS THAN
THE LOCAL AREA.


                   SEVERE WARNINGS THROUGH JUNE 18TH
----------------------------------------------------
NWS CHICAGO:                     44
NWS GREEN BAY WI:                46
NWS DULUTH MN:                   58


IT IS IMPORTANT TO REMEMBER THAN SEVERE WEATHER CAN STRIKE ANY TIME
OF THE YEAR ACROSS THE LOCAL AREA...AND LARGE OUTBREAKS HAVE OCCURRED
IN THE MID TO LATE SUMMER AND AUTUMN MONTHS. BUT AT PRESENT...THE
LOCAL AREA IS AROUND 60 PERCENT BELOW THE FOUR YEAR NORMAL FOR SEVERE
WEATHER REPORTS.

$$

MTF

Severe Weather Events this Year:

 


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