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000 

WWUS20 KWNS 292156

SEL9

SPC WW 292156

TXZ000-300400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 199

NWS STORM PREDICTION CENTER NORMAN OK

500 PM CDT SUN APR 29 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL AND NORTHWEST TEXAS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 500 PM UNTIL

1100 PM 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 55

STATUTE MILES EITHER SIDE OF A LINE FROM 55 MILES SOUTHWEST OF

SAN ANGELO TEXAS TO 45 MILES NORTHWEST OF WICHITA FALLS 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 198...



DISCUSSION...THUNDERSTORMS CONTINUE TO INCREASE IN AREAL COVERAGE

AND INTENSITY OVER PARTS OF WEST CENTRAL AND NORTHWEST TX THIS

AFTERNOON...IN VICINITY OF SURFACE OUTFLOW BOUNDARY.  DESPITE

MARGINAL DEEP LAYER AND LOW LEVEL VERTICAL SHEAR

PROFILES...SUFFICIENT INSTABILITY AND FORCING ALONG BOUNDARY ARE

AIDING IN DEVELOPMENT OF A FEW SEVERE STORMS CAPABLE OF LARGE HAIL

AND DAMAGING WINDS.



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 500. MEAN STORM

MOTION VECTOR 22025.





...HART

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