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WWUS20 KWNS 030348

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 81

NWS STORM PREDICTION CENTER NORMAN OK

1045 PM CDT TUE APR 2 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1045 PM

UNTIL 500 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF

COTULLA TEXAS TO 40 MILES EAST SOUTHEAST OF LAREDO TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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 79...WW 80...



DISCUSSION...AN EVOLVING QLCS --ANCHORED BY A SUPERCELL ON IT/S SRN

END-- OVER THE EDWARDS PLATEAU IS EXPECTED TO PROGRESS ESEWD THROUGH

PORTIONS OF THE HILL AND BRUSH COUNTRY OF TX INTO EARLY

WEDNESDAY...AIDED BY FORCING FOR ASCENT ATTENDANT TO A SHORT-WAVE

TROUGH MOVING THROUGH WRN TX.  AN OUTFLOW BOUNDARY WHICH HAS SETTLED

SWD TO ALONG A FRIO TO KARNES COUNTY LINE...WILL LIKELY DELIMIT THE

NRN BOUND OF MORE ORGANIZED STORM POTENTIAL.  THE TO SOUTH...THE

COMBINATION OF A MOIST...MODERATELY UNSTABLE AIR MASS AND 40-45 KT

OF DEEP-LAYER SHEAR WILL PROMOTE ORGANIZED STORM MODES WITH A RISK

FOR DAMAGING WINDS AND LARGE HAIL.



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 28030.





...MEAD

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