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000 

WWUS20 KWNS 172336

SEL5

SPC WW 172336

TXZ000-180800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 205

NWS STORM PREDICTION CENTER NORMAN OK

635 PM CDT THU APR 17 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 635 PM

UNTIL 300 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF

STEPHENVILLE TEXAS TO 25 MILES EAST OF DEL RIO TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 204...



DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO INCREASE IN

COVERAGE ALONG SE-MOVING COLD FRONT...AND POSSIBLY ALONG MORE

SLOWLY-MOVING DRY LINE...AS FORCING FOR ASCENT ASSOCIATED WITH W TX

UPR TROUGH CONTINUES EWD.  STRENGTHENING WIND FIELD AND DEEPLY-MIXED

ENVIRONMENT WILL BE PRESENT TO FOSTER LOCALLY DMGG WIND GUSTS...IN

ADDITION TO SVR HAIL.  STORMS MAY CONSOLIDATE INTO SEVERAL BROKEN

LINE SEGMENTS OR SMALL CLUSTERS LATER TONIGHT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25035.





...CORFIDI

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