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Mesoscale Discussion 1291
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   Mesoscale Discussion 1291
   NWS Storm Prediction Center Norman OK
   1010 PM CDT Tue Jul 11 2017

   Areas affected...eastern South Dakota

   Concerning...Severe Thunderstorm Watch 409...

   Valid 120310Z - 120415Z

   The severe weather threat for Severe Thunderstorm Watch 409

   SUMMARY...Threat for isolated large hail and damaging wind will
   persist through 04-05Z over eastern South Dakota followed by a
   general decrease in overall threat. The remaining portion of severe
   thunderstorm watch 409 is scheduled to expire at 04Z, but can be
   locally extended in time for an hour or so if needed.

   DISCUSSION...Thunderstorms that developed earlier along dryline
   persist over eastern SD. Some supercell structures remain with a
   threat for large hail. However, activity is primarily diurnally
   driven, and as the boundary layer cools with surface temperatures
   falling into the 70s, convective inhibition should increase
   significantly resulting in a general decrease in storm coverage and

   ..Dial.. 07/12/2017

   ...Please see for graphic product...


   LAT...LON   43669655 43709784 44649726 45109674 44849631 43669655 

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