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Mesoscale Discussion 1056
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   Mesoscale Discussion 1056
   NWS Storm Prediction Center Norman OK
   1135 PM CDT Mon Jun 29 2020

   Areas affected...Western Dakotas

   Concerning...Tornado Watch 318...

   Valid 300435Z - 300630Z

   The severe weather threat for Tornado Watch 318 continues.

   SUMMARY...Severe threat should remain focused across the western

   DISCUSSION...Slow-moving squall line has gradually weakened as it
   moved east across western ND. Trailing portion of this convection,
   with a few discrete supercells, continue to develop along the cool
   side of the boundary across the Black Hills region where isentropic
   ascent is greatest. Latest model data suggests LLJ will remain
   focused across western NE into western SD through early morning, and
   this should contribute to additional convection, much of it
   elevated, atop the cooler boundary layer. While elevated convection
   should pose mostly a hail risk, lone supercell over Perkins County
   SD may be rooted in the boundary layer as it lifts northeast along
   the wind shift. Damaging winds, hail, and perhaps a brief tornado
   remain possible with this activity.

   Some consideration may be needed to extend the watch if ongoing
   convection continues to progress northeast.

   ..Darrow.. 06/30/2020

   ...Please see for graphic product...


   LAT...LON   44500433 46770205 46320138 44200247 44500433 

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