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WWUS20 KWNS 040452

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 57

NWS STORM PREDICTION CENTER NORMAN OK

1155 PM CDT THU APR 3 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTH CENTRAL TEXAS



* EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1155 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

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

NORTHEAST OF COTULLA TEXAS TO 50 MILES SOUTH SOUTHEAST OF COTULLA

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 53...WW 55...WW 56...



DISCUSSION...A SMALL CLUSTER OF SUPERCELLS HAS DEVELOPED RECENTLY

ALONG THE COLD FRONT SE OF DRT.  STRONG INSTABILITY REMAINS IN

ADVANCE OF THE STORMS...WHICH MAY BE ABLE TO SURVIVE FOR A FEW HOURS

DESPITE SUBSTANTIAL CONVECTIVE INHIBITION.  GIVEN THE STRONG

INSTABILITY...LARGE HAIL SHOULD BE THE MAIN SEVERE STORM RISK.



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 30025.





...THOMPSON

