

000 

WWUS20 KWNS 240049

SEL9

SPC WW 240049

TXZ000-240400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 169

NWS STORM PREDICTION CENTER NORMAN OK

750 PM CDT MON APR 23 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST TEXAS



EFFECTIVE THIS MONDAY EVENING FROM 750 PM UNTIL 1100 PM CDT.



TORNADOES...HAIL TO 3 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 70 MILES NORTH NORTHEAST OF

DEL RIO TEXAS TO 75 MILES SOUTHEAST OF DEL RIO TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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 165...WW 166...WW

167...WW 168...



DISCUSSION...SMALL BUT INTENSE AND POTENTIALLY TORNADIC SUPERCELL

JUST WEST OF DRT AT 01Z MAY CONTINUE EWD FOR A COUPLE MORE HOURS.

OTHER DEVELOPMENT MAY OCCUR ACROSS WW THROUGH THE EVENING.  AIR MASS

IS VERY UNSTABLE AND STRONGLY SHEARED...SUGGESTING VERY LARGE HAIL

AND ISOLATED TORNADO THREAT WILL ACCOMPANY STRONGER CORES.  CAPPING

AND NOCTURNAL COOLING OF THE BOUNDARY LAYER MAY LIMIT EWD

DEVELOPMENT LATER THIS EVENING AND CONFINE MAIN THREAT NEARER THE

RIO GRANDE AND COUNTIES JUST EAST.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 27020.





...EVANS

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