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WWUS20 KWNS 031442

SEL6

SPC WW 031442

NEZ000-SDZ000-032200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 206

NWS STORM PREDICTION CENTER NORMAN OK

935 AM CDT TUE JUN 3 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHERN NEBRASKA

  CENTRAL AND SOUTHERN SOUTH DAKOTA



* EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 935 AM UNTIL

  500 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS

    TO 2.5 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST

SOUTHWEST OF PHILIP SOUTH DAKOTA TO 45 MILES NORTH NORTHEAST OF

ONEILL 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...STRONG TO SEVERE STORM DEVELOPMENT IS NOW WELL UNDERWAY

IN RESPONSE TO FORCING ASSOCIATED WITH LOWER/MID TROPOSPHERIC WARM

ADVECTION NEAR THE CREST OF PLAINS MID-LEVEL RIDGING.  A FURTHER

INCREASE IN CONVECTIVE DEVELOPMENT...CONSOLIDATION AND INCREASING

ORGANIZATION APPEARS LIKELY THROUGH MID AFTERNOON AS ACTIVITY

DEVELOPS EASTWARD TOWARD THE MID MISSOURI VALLEY.  ALTHOUGH

CONVECTION IS GENERALLY BASED ABOVE A STABLE BOUNDARY LAYER...THE

INITIAL SEVERE HAIL THREAT MAY TRANSITION TO BOTH A SEVERE WIND AND

HAIL THREAT.  THE RISK FOR TORNADOES MAY ALSO BEGIN TO INCREASE

ACROSS SOUTHERN/SOUTHEASTERN PORTIONS OF THE WATCH AREA TOWARD

20-22Z...IN THE PRESENCE OF INCREASING BOUNDARY LAYER INSTABILITY.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27030.





...KERR

