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Mesoscale Discussion 1166
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MD 1166 graphic

   Mesoscale Discussion 1166
   NWS Storm Prediction Center Norman OK
   0812 PM CDT Tue Jun 27 2017

   Areas affected...Southwestern South Dakota...Western/Central

   Concerning...Severe Thunderstorm Watch 372...

   Valid 280112Z - 280245Z

   The severe weather threat for Severe Thunderstorm Watch 372

   SUMMARY...Thunderstorm clusters capable of producing severe wind
   gusts are progressing eastward across southwestern South Dakota and
   west-central Nebraska.  The risk for severe winds from these
   clusters will continue into the evening hours.

   DISCUSSION...Thunderstorms have grown upscale across southwestern
   South Dakota producing several measured wind gusts.  This organized
   cluster of storms will move out of watch 372 over the next hour and
   into downstream watch 373, where low-level moisture and instability
   is maximized.

   There is a relative minimum in thunderstorm coverage across northern
   Nebraska with a second cluster of storms across west-central
   Nebraska.  This cluster of storms appears less organized on radar
   imagery and has not yet produced measured severe wind gusts.  As
   this cluster moves into an area of better moisture and instability,
   an increase in organization and intensity is expected over the next
   few hours.  There is uncertainty regarding the eastward extent of
   damaging wind gust potential as the boundary layer cools and
   surface-based convective inhibition increases.

   ..Jirak/Hart.. 06/28/2017

   ...Please see for graphic product...


   LAT...LON   41160176 41690150 42470132 43310167 43780215 44060210
               44220141 44359988 43479907 42669846 42159795 41329702
               40749734 40539885 40620026 40790147 41160176 

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