

721 

WWUS20 KWNS 080955

SEL6

SPC WW 080955

ARZ000-KSZ000-MOZ000-OKZ000-081700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 266

NWS STORM PREDICTION CENTER NORMAN OK

455 AM CDT FRI MAY 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN ARKANSAS

       SOUTHEAST KANSAS

       SOUTHERN MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS FRIDAY MORNING FROM 455 AM UNTIL NOON CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 80 MPH...LARGE HAIL

TO 2 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE IN

THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHEAST

OF WEST PLAINS MISSOURI TO 40 MILES WEST SOUTHWEST OF

BARTLESVILLE OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 264...WW 265...



DISCUSSION...A LARGE CLUSTER OF INTENSE CONVECTION OVER SOUTHEAST KS

WILL LIKELY ORGANIZE INTO A BOW ECHO THIS MORNING AND RACE

EAST-SOUTHEASTWARD ACROSS SOUTHWEST MO/NORTHEAST OK/NORTHWEST AR.

HIGH INSTABILITY AND RATHER STRONG WESTERLY FLOW ALOFT SUGGEST THAT

A CORRIDOR OF SIGNIFICANT DAMAGING WINDS IS POSSIBLE THROUGH THE MID

MORNING.  LARGE HAIL WILL ALSO REMAIN POSSIBLE IN THE STRONGEST

STORMS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29035.





...HART

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