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030 

WWUS20 KWNS 072254

SEL7

SPC WW 072254

KSZ000-OKZ000-080400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 147

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT TUE MAY 7 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHWEST KANSAS

  NORTHWEST OKLAHOMA



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 555 PM UNTIL

  1100 PM CDT.



* PRIMARY THREATS INCLUDE...

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

    INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES NORTH

NORTHEAST OF GARDEN CITY KANSAS TO 55 MILES SOUTHWEST OF ALVA

OKLAHOMA.  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.



&&



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS SOUTHWEST

KS AND NORTHWEST OK.  THESE STORMS ARE FORMING ALONG AN INSTABILITY

AXIS WHERE SUFFICIENT MLCAPE AND STEEP LAPSE RATES WILL PROMOTE HAIL

POTENTIAL IN THE STRONGEST STORMS.  THE LOW LEVEL JET WILL ALSO

STRENGTHEN THIS EVENING...HELPING TO MAINTAIN/ORGANIZE THE

CONVECTION DESPITE WEAKENING INSTABILITY AFTER DARK.



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 450. MEAN STORM

MOTION VECTOR 26025.





...HART

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