

000 

WWUS20 KWNS 311354

SEL1

SPC WW 311354

ARZ000-MOZ000-311900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 401

NWS STORM PREDICTION CENTER NORMAN OK

855 AM CDT SAT MAY 31 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       SOUTHWEST MISSOURI



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 855 AM UNTIL

200 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM GROVE OKLAHOMA TO 35

MILES EAST OF HARRISON ARKANSAS.  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 399...WW 400...



DISCUSSION...INTENSE...SMALL MCS OVER NERN OK WILL CONTINUE ESEWD

INTO WW THIS MORNING...AND COULD INTENSIFY WITH SURFACE HEATING BY

THE LATE MORNING.  STRONG WLY FLOW ALOFT ON SGF SOUNDING THIS

MORNING WILL FAVOR ORGANIZATION...POSSIBLY INTO A SMALL BOW ECHO.

ISOLATED LARGE HAIL WILL BE PRIMARY THREAT...HOWEVER DAMAGING WIND

POTENTIAL MAY INCREASE BY THE MID TO LATE MORNING.



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 28040.





...EVANS

