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WWUS20 KWNS 090001

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SPC WW 090001

TXZ000-090700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 260

NWS STORM PREDICTION CENTER NORMAN OK

700 PM CDT TUE MAY 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 700 PM

UNTIL 200 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 90 MILES NORTHEAST OF

DEL RIO TEXAS TO 35 MILES SOUTH SOUTHEAST OF DEL RIO TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 257...WW 258...WW 259...



DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO CONTINUE

DEVELOPING ON SRN END OF CNTRL TX MCS...WHERE UPLIFT ALONG SYSTEM

COLD POOL SHOULD PROVIDE ENOUGH ASCENT FOR NEW GROWTH GIVEN SELY LOW

LEVEL WARM SECTOR FLOW. DEEP WLY SHEAR...WHILE NOT STRONG...SHOULD

REMAIN SUPPORTIVE OF EMBEDDED SUSTAINED AND POSSIBLY ROTATING STORMS

GIVEN DIFFLUENT UPPER FLOW AND FAIRLY RICH MOISTURE INFLOW.



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 25025.





...CORFIDI

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