WATCHES: Severe Thunderstorm Watch Number 739

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

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