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WWUS20 KWNS 172004

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SPC WW 172004

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 166

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT FRI MAY 17 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND NORTH CENTRAL TEXAS



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

  800 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 3

    INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTH OF

BROWNWOOD TEXAS TO 50 MILES NORTH NORTHWEST OF MINERAL WELLS

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...CONVECTION IS DEEPENING OVER PARTS OF TX ALONG THE

DRYLINE TO THE EAST OF SJT AND EAST OF ABI.  AIR MASS EAST OF THE

DRYLINE IS MOIST AND VERY UNSTABLE WITH CAPE VALUES UP TO 4000 J/KG.

 ALTHOUGH WINDS ALOFT ARE RELATIVELY WEAK...VERY FAVORABLE

THERMODYNAMIC ENVIRONMENT/STEEP LAPSE RATES INDICATES THREAT FOR A

FEW STORMS TO PRODUCE VERY LARGE HAIL AND LOCALIZED DAMAGING WIND

GUSTS.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24015.





...WEISS

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