

000 

WWUS20 KWNS 010238

SEL7

SPC WW 010238

OKZ000-TXZ000-011000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 317

NWS STORM PREDICTION CENTER NORMAN OK

935 PM CDT THU MAY 31 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL OKLAHOMA

       EASTERN TEXAS PANHANDLE



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 935 PM

UNTIL 500 AM CDT.



HAIL TO 2 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 120

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH

NORTHWEST OF ALVA OKLAHOMA TO 10 MILES SOUTH SOUTHWEST OF ALTUS

OKLAHOMA.  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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 313. WATCH NUMBER 313 WILL NOT BE IN EFFECT

AFTER 935 PM CDT. CONTINUE...WW 314...WW 315...WW 316...



DISCUSSION...CLUSTER OF INTENSE THUNDERSTORMS ARE INCREASING IN

COVERAGE OVER THE NORTHERN TX AND OK PANHANDLES.  THESE STORMS ARE

EXPECTED TO ORGANIZE INTO A LINEAR MCS AND ACCELERATE

EAST-SOUTHEASTWARD ACROSS WESTERN AND CENTRAL OK OVERNIGHT.  VERY

UNSTABLE AIR MASS AND FAVORABLE VERTICAL SHEAR PROFILES SUGGEST THE

POTENTIAL FOR A WIDESPREAD DAMAGING WIND EVENT.



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 28030.





...HART

