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705 

WWUS20 KWNS 230403

SEL3

SPC WW 230403

ARZ000-KSZ000-MOZ000-OKZ000-231100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 183

NWS STORM PREDICTION CENTER NORMAN OK

1105 PM CDT FRI APR 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN ARKANSAS

       SMALL PART OF SOUTHEAST KANSAS

       LARGE PART OF SOUTHERN MISSOURI

       PARTS OF NORTHEAST OKLAHOMA



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1105 PM

UNTIL 600 AM CDT.



HAIL TO 3 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 65 MILES EAST

SOUTHEAST OF FORT LEONARD WOOD MISSOURI TO 50 MILES NORTH

NORTHWEST OF MUSKOGEE OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 181...WW 182...



DISCUSSION...THUNDERSTORMS ARE REDEVELOPING IN THE WARM ADVECTION

ACROSS THE WATCH AREA AHEAD OF THE COLD FRONT. WITH A MOIST AND

UNSTABLE AIR MASS IN PLACE COUPLED WITH STEEP MID LEVEL LAPSE RATES

AND 40-50KT OF SHEAR...SUPERCELLS ARE LIKELY.  PRIMARY THREAT

APPEARS TO BE VERY LARGE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24035.





...HALES

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