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581 

WWUS20 KWNS 271748

SEL1

SPC WW 271748

ARZ000-KSZ000-MOZ000-OKZ000-280000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 201

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM CDT MON APR 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHWEST ARKANSAS

       SMALL PART OF SOUTHEAST KANSAS

       MUCH OF SOUTHERN MISSOURI

       PARTS OF CENTRAL AND NORTHEAST OKLAHOMA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

700 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST OF

CHANDLER OKLAHOMA TO 25 MILES EAST OF FORT LEONARD WOOD MISSOURI.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 198...WW 199...WW 200...



DISCUSSION...AIR MASS AHEAD OF COLD FRONT HAS HEATED AND

DESTABILIZED.  THUNDERSTORMS DEVELOPING ALONG/AHEAD OF FRONT AND

WITH MLCAPES AOA 1000 J/KG AND 35-40KT OF DEEP LAYER SHEAR...SEVERE

STORMS INCLUDING LARGE HAIL ARE LIKELY.  POTENTIAL FOR ROTATING

STORMS WHICH WOULD INCREASE THREAT OF LARGE HAIL AND WIND DAMAGE.



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 450. MEAN STORM

MOTION VECTOR 24030.





...HALES

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