

394 

WWUS20 KWNS 272207

SEL2

SPC WW 272207

TXZ000-CWZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 142

NWS STORM PREDICTION CENTER NORMAN OK

505 PM CDT SAT APR 27 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH TEXAS

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 505

  PM UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM DEL RIO TEXAS TO 30

MILES EAST SOUTHEAST OF HUNTSVILLE TEXAS.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU2).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 141...



DISCUSSION...TSTMS FCST TO CONTINUE INCREASING IN COVERAGE THROUGH

AT LEAST EARLY EVENING ACROSS THIS AREA IN FRONTAL AND SEA-BREEZE

REGIMES...WITH OUTFLOW-BOUNDARY INTERSECTIONS ALSO OFFERING

LOCALIZED FOCI FOR TSTM INITIATION AND MAINTENANCE.  WITH WWD EXTENT

ACROSS WW AREA...EXPECT GREATER DEEP SHEAR...BUOYANCY...AND EXPECTED

ORGANIZATION OF SVR POTENTIAL...INCLUDING RISK OF

SIGNIFICANT/DAMAGING HAIL WITH ANY RELATIVELY DISCRETE SUPERCELLS.

HOWEVER...OVERALL COVERAGE MAY CONTINUE TO BE GREATER WITH EWD

EXTENT INTO SOMEWHAT WEAKER PARAMETER SPACE.  DAMAGING GUSTS AND

LARGE HAIL THEREFORE ARE POSSIBLE ACROSS ENTIRE WW AREA.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 30025.





...EDWARDS

