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
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