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Mesoscale Discussion 1055
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   Mesoscale Discussion 1055
   NWS Storm Prediction Center Norman OK
   0942 PM CDT Mon Jun 29 2020

   Areas affected...Western Dakotas

   Concerning...Tornado Watch 318...

   Valid 300242Z - 300445Z

   The severe weather threat for Tornado Watch 318 continues.

   SUMMARY...Severe threat is focusing mainly across the western
   Dakotas.

   DISCUSSION...Earlier supercells that formed over eastern MT/western
   ND have merged and grown upscale into a squall line over western ND.
   Latest radar data suggests the leading bow-type structure over
   Montrail County is moving northeast at 25kt and will likely exit the
   watch in a little over 1hr. Given the evolution into a linear MCS,
   it appears gusty winds will be the most common threat along the
   leading edge of this convection. Even so, some hail threat remains
   with embedded supercell structures. Watch will likely need to be
   extended downstream to include the northeastern-most counties of BIS
   CWA.

   ..Darrow.. 06/30/2020

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

   ATTN...WFO...BIS...

   LAT...LON   46000215 47400189 48160174 48870286 49470159 48770011
               47200034 45940147 46000215 

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