WATCHES: Severe Thunderstorm Watch Number 139

WWUS20 KWNS 041758
SEL9
SPC WW 041758
TXZ000-CWZ000-050100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 139
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM CDT WED APR 4 2012

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

DEEP SOUTH TEXAS AND THE COASTAL PLAIN
COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
800 PM 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 45
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES NORTH NORTHEAST
OF ANGLETON TEXAS TO 35 MILES NORTHWEST OF MCALLEN 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.

DISCUSSION...SUPERCELLS HAVE EVOLVED TODAY NEAR AN OUTFLOW BOUNDARY
SW OF HOU WITH ADDITIONAL TSTMS ANTICIPATED SWWD ALONG SYNOPTIC
FRONT AND DEVELOPING SEA BREEZE CIRCULATION. MODIFICATION OF 12Z
BRO/CRP SOUNDINGS FOR CURRENT SURFACE CONDITIONS INDICATES THAT AIR
MASS HAS BECOME WEAKLY CAPPED WITH MLCAPE OF 3000-3500 J/KG.
MOREOVER...HOU VAD SHOWS LIGHT SELY WINDS VEERING TO 50 KT AT 6 KM
AGL...INDICATIVE OF A CONTINUED SUPERCELL THREAT. LARGE HAIL AND
DAMAGING WIND GUSTS WILL BE THE PRIMARY HAZARDS WITH THESE STORMS.

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 550. MEAN STORM
MOTION VECTOR 30010.

...MEAD

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