

353 

WWUS20 KWNS 122032

SEL0

SPC WW 122032

TXZ000-130400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 390

NWS STORM PREDICTION CENTER NORMAN OK

330 PM CDT FRI JUN 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHWEST AND WEST CENTRAL TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 4 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 45 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST OF WICHITA FALLS

TEXAS TO 15 MILES SOUTH SOUTHEAST OF JUNCTION TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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 388...WW 389...



DISCUSSION...AN EXTREMELY UNSTABLE AND VIRTUALLY UNCAPPED AIR MASS

HAS DEVELOPED VICINITY AND JUST E OF DRY LINE.  VERY RAPID

DEVELOPMENT OF SEVERE THUNDERSTORMS POSSIBLE ACROSS THE WATCH.

GIVEN THE INSTABILITY AND 40-50 KT OF DEEP LAYER SHEAR...SUPERCELLS

ARE LIKELY WITH PRIMARY THREAT OF VERY LARGE HAIL. ADDITIONALLY AT

LEAST AN ISOLATED TORNADO THREAT IS LIKELY WITH ANY SUPERCELL THAT

DEVELOPS.  STORMS WILL MOVE/DEVELOP SLOWLY S OF E AWAY FROM DRY LINE

INITIATION AREA.



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

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

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

600. MEAN STORM MOTION VECTOR 30015.





...HALES

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