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452 

WWUS20 KWNS 280028

SEL4

SPC WW 280028

TXZ000-CWZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 144

NWS STORM PREDICTION CENTER NORMAN OK

725 PM CDT SAT APR 27 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  DEEP SOUTH TEXAS

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 725 PM

  UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

BEEVILLE TEXAS TO 65 MILES SOUTH SOUTHWEST OF ALICE TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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...WW 142...WW 143...



DISCUSSION...A CLUSTER OF STORMS EVOLVING NEAR THE RIO GRANDE RIVER

APPEARS TO BE GENERATING A COLD POOL...WHICH IS EXPECTED TO ADVANCE

TOWARD LOWER/MIDDLE TEXAS COASTAL AREAS THIS EVENING...AIDED BY 20+

KT WEST SOUTHWESTERLY DEEP LAYER MEAN FLOW.  IN THE PRESENCE OF

STEEP MID-LEVEL LAPSE RATES AND SIZABLE CAPE...STRONGEST CELLS WILL

PRODUCE LARGE HAIL AND A FEW DAMAGING WIND GUSTS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 27020.





...KERR

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