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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 270

NWS STORM PREDICTION CENTER NORMAN OK

535 PM CDT SAT JUN 1 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHWEST AND SOUTH CENTRAL TEXAS



* EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 535

  PM UNTIL 100 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 80

    MPH POSSIBLE

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

    2.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH

SOUTHWEST OF FORT STOCKTON TEXAS TO 25 MILES NORTH NORTHEAST OF

NEW BRAUNFELS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



&&



DISCUSSION...RAPID INTENSE THUNDERSTORM DEVELOPMENT IS ALREADY

UNDERWAY IN THE PECOS VALLEY...NEAR THE INTERSECTION OF THE DRYLINE

AND A SLOWLY SOUTHWARD ADVANCING COLD FRONT.  ADDITIONAL STORM

DEVELOPMENT APPEARS PROBABLE ALONG THE FRONT EASTWARD INTO THE HILL

COUNTRY... AS CONVECTIVE INHIBITION CONTINUES TO WEAKEN IN PEAK

AFTERNOON HEATING.  IN THE PRESENCE OF THERMODYNAMIC PROFILES

CHARACTERIZED BY A HOT AND DEEPLY MIXED BOUNDARY LAYER...STEEP

MID-LEVEL LAPSE RATES AND LARGE CAPE...AT LEAST A FEW SEVERE

THUNDERSTORMS ARE LIKELY THROUGH EARLY EVENING.  STRONGEST STORMS

WILL BE CAPABLE OF PRODUCING VERY LARGE HAIL AND STRONG DOWNBURSTS.

CONSOLIDATING COLD POOLS AND THE UPSCALE GROWTH INTO A LARGE STORM

CLUSTER MAY NOT BE OUT OF THE QUESTION BY MID EVENING.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 29010.





...KERR

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