

000 

WWUS20 KWNS 101838

SEL6

SPC WW 101838

ARZ000-MOZ000-OKZ000-110200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 376

NWS STORM PREDICTION CENTER NORMAN OK

140 PM CDT SUN JUN 10 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       FAR SOUTHWEST MISSOURI

       LARGE PART OF CENTRAL AND EASTERN OKLAHOMA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 140 PM UNTIL 900

PM CDT.



HAIL TO 2.5 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 30 MILES SOUTH

SOUTHEAST OF FLIPPIN ARKANSAS TO 25 MILES NORTHWEST OF CHICKASHA

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.



DISCUSSION...EXTREME INSTABILITY WITH MLCAPES TO 4000 J/KG IN PLACE

ACROSS MUCH OF WATCH AREA.  BOUNDARIES...PARTICULARLY NRN OK INTO

SWRN MO/NWRN AR EXPECTED TO BE FOCUS FOR RAPID DEVELOPMENT OF SEVERE

THUNDERSTORMS THIS AFTERNOON.  WITH SHEAR OF 25-30KT...POTENTIAL FOR

STORMS EVOLVING INTO MULTICELLULAR CLUSTERS AND ISOLATED SUPERCELLS.

PRIMARY THREAT WILL BE LARGE HAIL...DAMAGING DOWNBURSTS AND VERY

HEAVY RAINFALL.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 24020.





...HALES

