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004 

WWUS20 KWNS 120041

SEL7

SPC WW 120041

SDZ000-120600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 297

NWS STORM PREDICTION CENTER NORMAN OK

640 PM MDT TUE JUN 11 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN SOUTH DAKOTA



* EFFECTIVE THIS TUESDAY NIGHT FROM 640 PM UNTIL MIDNIGHT 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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH

NORTHEAST OF RAPID CITY SOUTH DAKOTA TO 45 MILES SOUTHEAST OF

RAPID CITY SOUTH DAKOTA.  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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 296...



DISCUSSION...SCATTERED INTENSE THUNDERSTORMS OVER NORTHEAST WY ARE

EXPECTED TO TRACK EASTWARD INTO WESTERN SD THIS EVENING.  BACKED LOW

LEVEL WINDS AND SUFFICIENT INSTABILITY WILL PROMOTE SUPERCELL STORM

STRUCTURES CAPABLE OF LARGE HAIL AND DAMAGING WINDS.  MODERATE CINH

VALUES MAY LIMIT AREAL COVERAGE OF STORMS AS THE ACTIVITY MOVES

EASTWARD.



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 26030.





...HART

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