

000 

WWUS20 KWNS 132340

SEL1

SPC WW 132340

TXZ000-CWZ000-140700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 61

NWS STORM PREDICTION CENTER NORMAN OK

640 PM CDT TUE MAR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 640 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF

LAREDO TEXAS TO 15 MILES NORTH NORTHEAST OF ANGLETON TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...SEVERE THUNDERSTORMS CONTINUE TO DEVELOP ON BOUNDARY

ACROSS SCENTRAL TX.  WITH APPROACH OF UPPER LOW AND INCREASE IN LLJ

THIS EVENING...SHEAR PROFILES WILL BECOME FAVORABLE FOR SUPERCELLS

AND ISOLATED TORNADOES.  AIR MASS IN WARM SECTOR IS MDTLY UNSTABLE

AND WEAKLY CAPPED.



AVIATION...TORNADOES AND 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 24030.





...HALES

