Mesoscale Discussion 0826
   NWS Storm Prediction Center Norman OK
   0655 PM CDT Thu Jun 04 2020

   Areas affected...Northeast WY...South Dakota...Northern Nebraska

   Concerning...Severe Thunderstorm Watch 252...

   Valid 042355Z - 050130Z

   The severe weather threat for Severe Thunderstorm Watch 252
   continues.

   SUMMARY...Severe threat should gradually increase across ww252.

   DISCUSSION...Two well-organized supercells have evolved over ww252
   this evening. This may be in part to 500mb speed max that is
   translating across the northern High Plains along the SD/ND border.
   Supercell over the northern Black Hills has likely produced very
   large hail at times and this storm appears to be cycling as it
   propagates southeast along the east slopes of the higher terrain.
   New convection is gradually deepening over Sheridan/Campbell County
   WY region and this activity will likely intensify as it approaches
   higher buoyancy. Given the northwest/southeast-oriented instability
   corridor over the Plains, severe threat is expected to spread
   southeast toward the NE border, in line with latest CAMs. Later this
   evening, supercells could spread into north-central NE.

   ..Darrow.. 06/04/2020

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

   ATTN...WFO...FSD...ABR...LBF...UNR...

   LAT...LON   44680438 44800171 44009905 42739888 42640063 43680355
               43990440 44680438