

054 

WWUS20 KWNS 121246

SEL7

SPC WW 121246

ARZ000-KSZ000-MOZ000-OKZ000-122000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 387

NWS STORM PREDICTION CENTER NORMAN OK

745 AM CDT FRI JUN 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       SOUTHERN KANSAS

       SOUTHWEST MISSOURI

       NORTHERN AND EASTERN OKLAHOMA



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 745 AM UNTIL 300

PM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

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

SOUTHWEST OF PONCA CITY OKLAHOMA TO 40 MILES EAST SOUTHEAST OF

FAYETTEVILLE ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 386...



DISCUSSION...STRENGTHENING BOW ECHO OVER NORTH CENTRAL OK IS

EXPECTED TO ACCELERATE SOUTHEASTWARD AND TRACK INTO WESTERN AR LATER

TODAY...AND EXPAND SOUTHWARD INTO VERY MOIST/UNSTABLE AIRMASS.

MORNING SOUNDINGS SHOW THE POTENTIAL FOR AFTERNOON MLCAPE OF

3000-4000 J/KG AND SUFFICIENT EFFECTIVE SHEAR TO MAINTAIN RISK OF

DAMAGING WINDS AND HAIL.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

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

MOTION VECTOR 29035.





...HART

