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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