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WWUS20 KWNS 242039

SEL5

SPC WW 242039

COZ000-KSZ000-NEZ000-250400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 215

NWS STORM PREDICTION CENTER NORMAN OK

240 PM MDT FRI MAY 24 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN COLORADO

  WESTERN KANSAS

  SOUTHWEST NEBRASKA AND THE SOUTHERN PANHANDLE



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

  1000 PM MDT.



* 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

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 5 MILES WEST SOUTHWEST

OF LIBERAL KANSAS TO 40 MILES NORTH NORTHEAST OF SIDNEY NEBRASKA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...WIDELY SCATTERED TSTMS ARE EXPECTED TO DEVELOP THIS

AFTERNOON AND EVENING FROM THE VICINITY OF A SURFACE LOW OVER NERN

CO SWD ALONG A LEE TROUGH/DRYLINE.  AMBIENT ENVIRONMENT IS

CHARACTERIZED BY STEEP LAPSE RATES...MLCAPE OF 1000-2000 J/KG...AND

VERTICALLY VEERING WIND PROFILES WITH STEADILY STRENGTHENING

DEEP-LAYER SHEAR.  AS SUCH...THE POTENTIAL WILL EXIST FOR SUPERCELLS

AS THE INITIAL STORM MODE WITH A RISK FOR LARGE HAIL AND PERHAPS A

TORNADO.  UPSCALE GROWTH OF STORMS INTO CLUSTERS IS ANTICIPATED

LATER THIS EVENING WITH AN INCREASED THREAT FOR DAMAGING WINDS.



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 23020.





...MEAD

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