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000 

WWUS20 KWNS 131728

SEL3

SPC WW 131728

TXZ000-140000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 133

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM CDT FRI APR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

700 PM CDT.



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

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 70 MILES WEST SOUTHWEST OF

BROWNWOOD TEXAS TO 20 MILES WEST NORTHWEST OF WICHITA FALLS

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



DISCUSSION...SCATTERED THUNDERSTORMS WILL DEVELOP EARLY THIS

AFTERNOON ALONG DRYLINE WEST OF ABI-SJT.  THESE STORMS WILL MOVE

EASTWARD INTO AN INCREASINGLY MOIST AND UNSTABLE AIR MASS.  BACKED

LOW LEVEL WINDS AND OBSERVED VERTICAL SHEAR PROFILES APPEAR VERY

FAVORABLE FOR SUPERCELLS CAPABLE OF TORNADOES...AS WELL AS VERY

LARGE HAIL AND DAMAGING WINDS.  STRONG TORNADOES ARE POSSIBLE.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 25035.





...HART

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