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Severe Thunderstorm Watch 317
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WW0317 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL7

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 317
   NWS STORM PREDICTION CENTER NORMAN OK
   800 PM MDT TUE JUN 17 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     SOUTHEAST MONTANA
     WESTERN SOUTH DAKOTA
     NORTHEAST WYOMING

   * EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 800 PM
     UNTIL 100 AM MDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL AND 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 50
   STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
   NORTHWEST OF BAKER MONTANA TO 65 MILES SOUTH 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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 311. WATCH NUMBER 311 WILL NOT BE IN EFFECT
   AFTER 800 PM MDT. CONTINUE...WW 313...WW 314...WW 315...

   DISCUSSION...SCATTERED SUPERCELLS WILL PERSIST FOR SEVERAL MORE
   HOURS ACROSS WRN SD AND VICINITY...ALONG A GENERAL NW-SE AXIS OF
   CONVERGENCE.  THE 00Z RAPID CITY SOUNDING SHOWED VERY STRONG
   BUOYANCY/STEEP LAPSE RATES WITH A SUPERCELL WIND PROFILE...WHICH
   WILL CONTINUE TO SUPPORT A RISK FOR ISOLATED VERY LARGE HAIL.  IN
   THE SHORT TERM...A TORNADO CANNOT BE RULED OUT BEFORE THE BOUNDARY
   LAYER STABILIZES.

   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 550. MEAN STORM
   MOTION VECTOR 32010.


   ...THOMPSON
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Page last modified: June 18, 2014
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