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WWUS20 KWNS 161908

SEL6

SPC WW 161908

NEZ000-SDZ000-170200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 316

NWS STORM PREDICTION CENTER NORMAN OK

205 PM CDT SUN JUN 16 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL NEBRASKA

  EXTREME SOUTHWESTERN SOUTH DAKOTA



* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

  900 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

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF

VALENTINE NEBRASKA TO 35 MILES EAST OF MCCOOK NEBRASKA.  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...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE

ALONG AN OUTFLOW BOUNDARY OVER EXTREME SOUTHWESTERN SOUTH DAKOTA AND

NORTHWESTERN NEBRASKA. ACTIVITY WILL THEN SPREAD SOUTHEASTWARD

ACROSS THE REMAINDER OF WESTERN NEBRASKA INTO PORTIONS OF CENTRAL

NEBRASKA. SUPERCELLS WILL BE POSSIBLE INITIALLY...BUT UPSCALE GROWTH

INTO AN MCS IS EXPECTED LATER THIS AFTERNOON INTO THE EVENING. LARGE

HAIL AND DAMAGING WIND GUSTS WILL BE THE PRIMARY THREATS...BUT A

TORNADO OR TWO WILL ALSO BE POSSIBLE ALONG AN OUTFLOW BOUNDARY OVER

WESTERN AND NORTH CENTRAL NEBRASKA.



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 33030.





...THOMPSON

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