WATCHES: Tornado Watch Number 430

WWUS20 KWNS 301544
SEL0
SPC WW 301544
TXZ000-CWZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
1045 AM CDT WED JUN 30 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

THE LOWER AND MIDDLE TEXAS COAST
COASTAL WATERS

EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1045 AM UNTIL
800 PM CDT.

TORNADOES...HAIL TO 0.5 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 35 MILES NORTHEAST OF CORPUS
CHRISTI TEXAS TO 40 MILES EAST SOUTHEAST OF MCALLEN TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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...HURRICANE ALEX CONTINUES TO MOVE TOWARD EXTREME NE
MEXICO...LEAVING S TX IN THE RIGHT FRONT QUADRANT OF THE STORM
CIRCULATION. LOCAL VWP/S HAVE SHOWN AN INCREASE IN LOW-LEVEL
FLOW/SHEAR OVER THE PAST FEW HOURS...AND EMBEDDED SUPERCELL
STRUCTURES ARE TENDING TO SURVIVE CLOSER TO THE COAST WITH TIME IN
THE BANDS N OF THE STORM CENTER. GIVEN THE PRESENCE OF 77-80 F
DEWPOINTS...SURFACE-BASED INSTABILITY...AND INCREASING VERTICAL
SHEAR...THE PROBABILITY OF A FEW TORNADOES WILL SLOWLY INCREASE
THROUGH THE AFTERNOON.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 09035.

...THOMPSON

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