

012 

WWUS20 KWNS 020309

SEL9

SPC WW 020309

TXZ000-CWZ000-021000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 739

NWS STORM PREDICTION CENTER NORMAN OK

1005 PM CDT MON NOV 1 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN TEXAS

       COASTAL WATERS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1005 PM

UNTIL 500 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 100

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHWEST OF

COTULLA TEXAS TO 60 MILES EAST OF AUSTIN TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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 738...



DISCUSSION...TSTMS NOW FORMING ALONG WRN EXTENSION OF LOW LVL

CONFLUENCE ZONE ASSOCIATED WITH ERN AND SE TX STORMS...AND ELEVATED

STORMS FORMING ATOP SHALLOW FRONTAL IN THE TX HILL

COUNTRY...EXPECTED TO INCREASE IN COVERAGE AND STRENGTH THROUGH

EARLY TUE AS LARGE SCALE ASCENT/MID LVL COOLING SPREAD SEWD IN

ASSOCIATION WITH AMPLIFYING W TX UPR VORT.  QUALITY OF LOW LVL

MOISTURE...STEEPENING MID LVL LAPSE RATES...AND STRENGTHENING OF

MID/UPR LVL WIND FIELD TOGETHER SUGGEST SOME LIKELIHOOD FOR ROTATING

STORMS AND BOWING SEGMENTS WITH SVR HAIL/WIND...DESPITE POTENTIAL

FOR DESTRUCTIVE INTERFERENCE OF STORMS.  ACTIVITY SHOULD MERGE INTO

ONE OR TWO COMPLEX MCSS THAT MOVE MAINLY SE TO THE CNTRL/LWR TX GULF

CST LATER IN THE WATCH PERIOD.



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

