

000 

WWUS20 KWNS 132325

SEL8

SPC WW 132325

TXZ000-140700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 138

NWS STORM PREDICTION CENTER NORMAN OK

625 PM CDT FRI APR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL TEXAS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 625 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2.5 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 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF AUSTIN TEXAS

TO 50 MILES SOUTH SOUTHEAST OF HONDO 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 133...WW 134...WW

135...WW 136...WW 137...



DISCUSSION...THUNDERSTORMS DEVELOPING ALONG/AHEAD OF COLD FRONT.

WITH MLCAPES TO 3000 J/KG AND DEEP LAYER SHEAR OF 50-60KT SUPERCELLS

ARE EXPECTED AS STORMS DEVELOP E.  WHILE PRIMARY THREAT WILL BE VERY

LARGE HAIL/DAMAGING WINDS WITH MARGINAL LOW LEVEL SHEAR...THE

INSTABILITY SUPPORTS A TORNADO THREAT...PARTICULARLY EWD TOWARD THE

I-35 CORRIDOR DURING THE EVENING.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 26035.





...HALES

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