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Mesoscale Discussion 650
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   Mesoscale Discussion 0650
   NWS Storm Prediction Center Norman OK
   0727 PM CDT Wed May 20 2020

   Areas affected...Easern Montana

   Concerning...Severe Thunderstorm Watch 197...

   Valid 210027Z - 210200Z

   The severe weather threat for Severe Thunderstorm Watch 197
   continues.

   SUMMARY...Severe threat should spread northeast across ww197.

   DISCUSSION...Water-vapor imagery depicts a short-wave trough
   ejecting northeast across WY toward eastern MT. Large-scale forcing
   for ascent appears to be aiding broken squall line as it propagates
   across the plains toward a corridor of modest instability over
   eastern portions of ww197. With LLJ expected to increase across
   western ND into southeast SK later this evening, this convection
   should spread toward the international border into portions of
   extreme western ND. Latest hail algorithm output continues to
   suggest large hail is noted with supercell structures and this
   should be the primary concern, though some wind is also possible.

   ..Darrow.. 05/21/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...BYZ...GGW...TFX...

   LAT...LON   45000927 48910983 48920433 45010416 45000927 

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