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000 

WWUS20 KWNS 060052

SEL8

SPC WW 060052

OKZ000-TXZ000-060800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 238

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT SAT MAY 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       WESTERN AND NORTHWEST TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 750 PM

UNTIL 300 AM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF

CHILDRESS TEXAS TO 20 MILES EAST SOUTHEAST OF MIDLAND TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 232...WW 234...WW

235...WW 236...WW 237...



DISCUSSION...ISOLATED STORMS APPEAR TO BE FORMING INVOF ERN-MOST DRY

LINE IN W TX.  AREA SFC DATA SHOW VERY RICH MOISTURE IN PLACE E OF

LINE WITH SUBSTANTIAL SELY COMPONENT.  COUPLED WITH EXISTING 40-50

KT DEEP WSWLY SHEAR...NOCTURNAL STRENGTHENING OF LLJ...AND A

POSSIBLE INCREASE IN LARGE SCALE ASCENT AHEAD OF SLOWLY PROGRESSIVE

AZ TROUGH...SETUP MAY SUPPORT A FEW SUPERCELLS WITH VERY LARGE HAIL

AND TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 22030.





...CORFIDI

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