

000 

WWUS20 KWNS 120902

SEL9

SPC WW 120902

TXZ000-CWZ000-121300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 59

NWS STORM PREDICTION CENTER NORMAN OK

405 AM CDT MON MAR 12 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING FROM 405 AM UNTIL 800 AM CDT.



TORNADOES...HAIL TO 1 INCH 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 30 MILES NORTH OF HOUSTON

TEXAS TO 25 MILES EAST SOUTHEAST OF PALACIOS 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.



DISCUSSION...WELL ORGANIZED LINEAR MCS WITH SEVERAL EMBEDDED LEWP

STRUCTURES WILL CONTINUE EWD ACROSS SE TX THROUGH THE EARLY MORNING

HOURS.  THE LOW LEVELS SHOULD DESTABILIZE SUFFICIENTLY FOR

CONVECTION TO BE BASED AT THE SURFACE...WHILE LOW-LEVEL SHEAR WILL

BE STRONG ENOUGH TO MAINTAIN A THREAT FOR A COUPLE OF TORNADOES AND

A FEW DAMAGING GUSTS WITHIN THE MOIST ENVIRONMENT.



AVIATION...TORNADOES AND 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 27030.





...THOMPSON

