WATCHES: Tornado Watch Number 183

WWUS20 KWNS 250340
SEL3
SPC WW 250340
TXZ000-251100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 183
NWS STORM PREDICTION CENTER NORMAN OK
1040 PM CDT TUE APR 24 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

CENTRAL AND SOUTH CENTRAL TEXAS

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1040 PM
UNTIL 600 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF AUSTIN TEXAS
TO 25 MILES WEST SOUTHWEST OF LAREDO 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 179. WATCH NUMBER 179 WILL NOT BE IN EFFECT AFTER
1040 PM CDT. CONTINUE...WW 180...WW 181...WW 182...

DISCUSSION...INTENSE THUNDERSTORMS CONTINUE INVOF THE RIO GRANDE
RIVER LATE THIS EVENING WHERE AIR MASS IS VERY UNSTABLE. MODERATE
TO STRONGLY UNSTABLE AIR MASS AND INTENSE LOW-DEEP LAYER SHEAR WILL
PERSIST ACROSS WW OVERNIGHT IN ADVANCE OF APPROACHING UPPER LOW AND
SURFACE COLD FRONT. THIS WILL SUPPORT THREAT OF SEVERE
THUNDERSTORMS/SUPERCELLS...INCLUDING TORNADOES...WITH STORMS
DEVELOPING OVER THIS REGION OVERNIGHT.

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
500. MEAN STORM MOTION VECTOR 24035.

..EVANS

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