Reecom - NOAA Weather Radio - Cold-Air Funnels

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
931 PM EDT SAT MAY 14 2011

...COLD AIR FUNNELS POSSIBLE TONIGHT...

GENERALLY FUNNEL CLOUDS DEVELOP AND OCCUR IN CONJUNCTION WITH
CONDITIONS THAT PRODUCE SEVERE THUNDERSTORMS.

AN ENTIRELY DIFFERENT CONDITION PREVAILS ACROSS CENTRAL INDIANA
TONIGHT. THERE IS LITTLE POTENTIAL FOR SEVERE THUNDERSTORMS.

RESEARCH STUDIES OF FUNNEL CLOUD OCCURRENCES INDICATE THAT A
DIFFERENT TYPE 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
CONDITIONS.

COLD AIR FUNNELS ARE ASSOCIATED WITH THUNDERSTORMS THAT FORM IN
DEEP...COLD CORE...LARGE SCALE LOW PRESSURE SYSTEMS. THESE FUNNEL
CLOUDS ARE SMOOTH AND NARROW. THEIR PARENT THUNDERSTORMS ARE NOT
PARTICULARLY TALL OR INTENSE. THESE FUNNEL CLOUDS NORMALLY PROTRUDE
A FEW HUNDRED FEET DOWNWARD FROM THE PARENT CLOUDS...ROTATE OR SPIN
LIKE A TOP...AND LAST A FEW MINUTES BEFORE DISSIPATING.

IN RARE CASES WHERE THEIR CIRCULATIONS DO REACH THE GROUND...COLD
AIR FUNNELS GENERALLY CAUSE ONLY MINOR DAMAGE. MORE REPORTS OF
SMALL FUNNEL CLOUDS ARE POSSIBLE OVER CENTRAL INDIANA TONIGHT. WARNINGS
WILL BE ISSUED IF ANY OF THEM TOUCH THE GROUND.

&&

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