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Mesoscale Discussion 1008
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   Mesoscale Discussion 1008
   NWS Storm Prediction Center Norman OK
   0233 AM CDT Tue Jun 13 2017

   Areas affected...northeast and north-central SD...southeast ND

   Concerning...Severe Thunderstorm Watch 322...

   Valid 130733Z - 130830Z

   The severe weather threat for Severe Thunderstorm Watch 322

   SUMMARY...Widespread 50-70 mph gusts are likely for at least the
   next couple of hours.  The need for a new severe thunderstorm watch
   into southeastern ND is unlikely but a watch extension-in-area (EXA)
   could be used for the northeastern-most counties in SD if severe
   gusts are still occurring as the squall line moves through Spink and
   Brown counties.

   DISCUSSION...Radar mosaic shows a severe squall line moving
   northeast at 50 kt on the apex of a bowing segment moving into
   southwestern Faulk county as of 0730Z.  Surface observations on
   either end of the squall line recorded severe gusts (KMBG 51 kt at
   0653Z; KPIR 62 kt at 0619Z).  Expecting the potential for severe
   gusts to remain high, especially ahead of the bowing segment moving
   northeast towards Aberdeen with radar velocities from KABR
   indicating an intense rear-inflow jet (75-85 kt at 5,000 ft).  07Z
   surface data shows pressure falls are occurring (2mb/2hr) ahead of
   the line in northeast SD.  The steep mid-level lapse rate
   environment will remain very supportive of squall line longevity and
   expecting widespread 50-70 mph gusts with localized gusts with the
   bowing segment in the 60-85 mph range.

   ..Smith.. 06/13/2017

   ...Please see for graphic product...


   LAT...LON   46269988 46569828 46529741 46279683 45709653 45209656
               44809691 43989977 45930043 46269988 

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