WATCHES: Tornado Watch Number 138

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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