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WWUS20 KWNS 312316

SEL6

SPC WW 312316

TXZ000-CWZ000-010600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 76

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CDT SUN MAR 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 615 PM UNTIL

100 AM 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 60

STATUTE MILES EITHER SIDE OF A LINE FROM 10 MILES NORTHWEST OF

LAREDO TEXAS TO 20 MILES SOUTHEAST OF BEEVILLE TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 73...WW 74...WW 75...



DISCUSSION...SEVERE STORMS --INCLUDING SUPERCELLS-- OVER ERN

PORTIONS OF THE EDWARDS PLATEAU ARE EXPECTED TO MOVE/DEVELOP SSEWD

ACROSS THE WATCH AREA THIS EVENING INTO TONIGHT IN TANDEM WITH A

COMPOSITE FRONT/OUTFLOW BOUNDARY SETTLING SWD.  AMBIENT...INFLOW AIR

MASS IS HOT AND RELATIVELY MOIST WITH STEEP LOW TO MIDLEVEL LAPSE

RATES AND RESULTANT MLCAPE OF 1500-2000 J/KG.  WHEN COUPLED WITH A

VERTICALLY VEERING WIND PROFILE WITH 40-50 KT OF DEEP...WNWLY

SHEAR...THE SETUP WILL REMAIN SUPPORTIVE OF SUPERCELLS CAPABLE OF

LARGE HAIL AND DAMAGING WINDS THROUGH THIS EVENING.



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 500. MEAN STORM

MOTION VECTOR 33025.





...MEAD

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