WATCHES: Severe Thunderstorm Watch Number 180

WWUS20 KWNS 242145
SEL0
SPC WW 242145
IAZ000-MNZ000-WIZ000-250400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 180
NWS STORM PREDICTION CENTER NORMAN OK
445 PM CDT FRI APR 24 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST THROUGH NORTHEAST IOWA
SOUTHEAST MINNESOTA
CENTRAL INTO NORTHERN WISCONSIN

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 445 PM UNTIL
1100 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH
NORTHWEST OF SHENANDOAH IOWA TO 15 MILES SOUTHEAST OF RHINELANDER
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...SEVERE THUNDERSTORMS WILL CONTINUE TO INCREASE ALONG
AND AHEAD OF STRONG SURFACE COLD FRONT PUSHING SEWD ACROSS WW
THROUGH THE EVENING. VERY WARM SURFACE TEMPERATURES AND INCREASING
ASCENT WILL WEAKEN CAP AND STEEPEN LAPSE RATES SUPPORTING THREAT OF
HAIL WITH THE STRONGER STORMS. IN ADDITION...SHEAR WILL BE
SUFFICIENT FOR SUPERCELLS. ISOLATED DAMAGING WINDS AND POSSIBLY A
TORNADO ARE ALSO EXPECTED.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25030.

...EVANS

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