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WWUS20 KWNS 030759

SEL5

SPC WW 030759

OKZ000-TXZ000-031300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 335

NWS STORM PREDICTION CENTER NORMAN OK

300 AM CDT SUN JUN 3 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       NORTHWEST TEXAS



EFFECTIVE THIS SUNDAY MORNING FROM 300 AM UNTIL 800 AM 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST

NORTHWEST OF ALTUS OKLAHOMA TO 30 MILES EAST NORTHEAST OF WICHITA

FALLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...LINEAR MCS CONTINUES TO BECOME MORE ORGANIZED

APPROACHING WW EARLY THIS MORNING.  PRECEEDING AIR MASS REMAINS

MODERATE TO STRONGLY UNSTABLE...THOUGH STILL SOMEWHAT CAPPED TO

SURFACE PARCELS.  IN ADDITION...EFFECTIVE SHEAR FROM 35-40 KT WILL

SUSTAIN ORGANIZED STORMS IN THE FORM OF A LARGER BOW ECHO SYSTEM OR

ISOLATED SUPERCELLS AHEAD OF THE LINE.  LARGE HAIL SHOULD ACCOMPANY

MORE INTENSE CORES...THOUGH PRIMARY THREAT MAY BECOME DAMAGING WINDS

AS LINE OF STORMS MOVES QUICKLY SEWD ACROSS WW.



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 30035.





...EVANS

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