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000 

WWUS20 KWNS 030317

SEL5

SPC WW 030317

TXZ000-CWZ000-031100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 215

NWS STORM PREDICTION CENTER NORMAN OK

1020 PM CDT WED MAY 2 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       THE MIDDLE AND UPPER TEXAS COASTAL PLAIN

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1020 PM

UNTIL 600 AM CDT.



HAIL TO 1 INCH 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES WEST

SOUTHWEST OF HOUSTON TEXAS TO 40 MILES EAST NORTHEAST OF

HUNTSVILLE 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 212...WW 214...



DISCUSSION...TSTMS EXPECTED TO PERSIST/DEVELOP ALONG LEADING EDGE OF

COMPOSITE GUST FRONT ASSOCIATED WITH HILL COUNTRY STORMS.  AS REGION

IS GLANCED BY STRONGER MID LEVEL FLOW/ASCENT ASSOCIATED WITH ERN

NM/W TX UPR LOW...SETUP MAY SUPPORT A FEW EMBEDDED SUSTAINED STORMS/

SUPERCELLS.  THESE MAY YIELD HIGH WIND...SOME HAIL AND POSSIBLY A

BRIEF TORNADO THROUGH EARLY THURSDAY.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 24035.





...CORFIDI

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