

000 

WWUS20 KWNS 250147

SEL9

SPC WW 250147

TXZ000-250500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 649

NWS STORM PREDICTION CENTER NORMAN OK

850 PM CDT FRI AUG 24 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       THE TEXAS SOUTH PLAINS



EFFECTIVE THIS FRIDAY NIGHT FROM 850 PM UNTIL MIDNIGHT 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 45

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF

LUBBOCK TEXAS TO 95 MILES EAST OF LUBBOCK TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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 648...



DISCUSSION...STORM MERGERS HAVE RESULTED IN COLD POOL FORMATION AND

ACCELERATED STORM MOTION TO THE SSE NEAR PLAINVIEW.  THIS CONVECTIVE

CLUSTER WILL BE CAPABLE OF PRODUCING DAMAGING WINDS,,.AND LARGE

HAIL...WHILE PROPAGATING SEWD INTO THE INSTABILITY AXIS OVER W TX.



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 550. MEAN STORM

MOTION VECTOR 32035.





...THOMPSON

