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Sat, 20 Sep 1997 13:55:32 -0500 (CDT)
Date: Sat, 20 Sep 1997 13:55:30 -0500 (CDT)
From: MILWAUKEE AREA SKYWARN ASSOCIATION <svoros{at}execpc.com>
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To: Skip Voros <svoros{at}execpc.com>
Subject: Cold Air Funnel clouds!
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MASA ("May-sah")
Promoting severe weather Identification, Evaluation, & Reporting.
*****************************************************************
....A little storm spotter training:
Not all funnel clouds are created equally, and
here in the upper midwest the seasonal change shows
itself in variety of ways, the COLD AIR FUNNEL is
one such example.
SPECIAL WEATHER STATEMENT...CORRECTION...
NATIONAL WEATHER SERVICE MILWAUKEE WI
920 AM CDT SAT SEPT 20 1997
...COLD AIR FUNNELS REPORTED OVER EASTERN WISCONSIN...
A 915 AM THE FOND DU LAC COUNTY SHERIFF DEPARTMENT RECEIVED SEVERAL
CITIZEN REPORTS OF FUNNEL CLOUDS OVER PORTIONS OF EASTERN FOND DU LAC
COUNTY. THESE FUNNEL CLOUDS WERE ASSOCIATED WITH SCATTERED SHOWERS
MOVING THROUGH THIS AREA AND ARE EXPECTED TO END BY EARLY AFTERNOON.
GENERALLY FUNNEL CLOUDS DEVELOP AND OCCUR IN CONJUNCTION WITH WELL
DEVELOPED AND INTENSE THUNDERSTORMS WHICH HAVE FORMED IN A WARM MOIST
AIRMASS. THUNDERSTORMS OF THIS VARIETY AND INTENSITY NEARLY ALWAYS
FORM ALONG AND SOME DISTANCE AHEAD OF A STRONG COLD FRONT. WHEN FUNNEL
CLOUDS ARE IN ASSOCIATION WITH THIS TYPE OF THUNDERSTORM THEY
FREQUENTLY DIP TO THE GROUND AND HAVE SUFFICIENT FORCE TO DESTROY
EVERYTHING ALONG THEIR PATH. A FUNNEL CLOUD THAT TOUCHES THE GROUND IS
CALLED A TORNADO.
AN ENTIRELY DIFFERENT CONDITION PREVAILS OVER EASTERN WISCONSIN TODAY.
THERE ARE NO STRONG COLD FRONTS IN THE AREA. THERE IS LITTLE POTENTIAL
FOR INTENSE THUNDERSTORMS.
RESEARCH STUDIES OF FUNNEL CLOUD OCCURRENCES DURING THE PAST SEVERAL
YEARS INDICATE THAT A SOMEWHAT DIFFERENT SPECIES OF FUNNEL CLOUD
FORMS WHEN WEATHER CONDITIONS ARE SIMILAR TO THOSE OF TODAY. THESE ARE
CALLED COLD AIR FUNNELS AND ARE NOT AS VIOLENT AS THOSE ASSOCIATED WITH
WARM AND HUMID WEATHER CONDITIONS.
THESE STUDIES OF COLD AIR FUNNELS SHOW THEY RARELY DO ANY DAMAGE. THESE
FUNNEL CLOUDS NORMALLY PROTRUDE A FEW HUNDRED FEET DOWNWARD FROM THE
PARENT CLOUD...ROTATE OR SPIN LIKE A TOP...AND LAST A FEW MINUTES
BEFORE DISSIPATING.
MORE REPORTS OF SMALL FUNNEL CLOUDS ARE POSSIBLE OVER EASTERN WISCONSIN
THIS MORNING BUT ARE EXPECTED TO REMAIN ALOFT.
DAVIS
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