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000 

WWUS20 KWNS 300051

SEL0

SPC WW 300051

TXZ000-300800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 200

NWS STORM PREDICTION CENTER NORMAN OK

745 PM CDT SUN APR 29 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL

300 AM 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 55 STATUTE

MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF

HONDO TEXAS TO 60 MILES NORTHWEST OF DRYDEN TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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 198. WATCH NUMBER 198 WILL NOT BE IN EFFECT AFTER

745 PM CDT. CONTINUE...WW 199...



DISCUSSION...WARM/MOIST AND VERY UNSTABLE AIR MASS FROM THE

TRANS-PECOS REGION SEWD ALONG THE RIO GRANDE VALLEY AND SRN EDGE OF

THE EDWARDS PLATEAU IS EXPECTED TO SUPPORT A CONTINUATION OF STRONG

TO SEVERE TSTMS TONIGHT. THIS ACTIVITY WILL BE FURTHER SUSTAINED AS

LARGE SCALE DIFFLUENCE...AHEAD OF AN UPPER LOW...SPREADS EWD ATOP

THE UNSTABLE WARM SECTOR. LOW LEVEL SELY FLOW TOPPED BY

STRENGTHENING WLY FLOW ALOFT WILL CONTRIBUTE TO SHEAR PROFILES

FAVORABLE FOR SUPERCELLS WITH LARGE HAIL. TORNADO POTENTIAL WILL

ALSO EXIST GIVEN ABUNDANT LOW LEVEL MOISTURE AND LOW LEVEL

DIRECTIONAL SHEAR.



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 23020.





...CARBIN/HART

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