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Mesoscale Discussion 1358
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   Mesoscale Discussion 1358
   NWS Storm Prediction Center Norman OK
   0712 PM CDT Mon Jul 26 2021

   Areas affected...Northeast MN into northwest WI

   Concerning...Severe Thunderstorm Watch 393...

   Valid 270012Z - 270145Z

   The severe weather threat for Severe Thunderstorm Watch 393

   SUMMARY...The threat for very large hail and locally damaging wind
   continues with ongoing supercell cluster across northeast MN. This
   cluster will likely spread into northwest WI, where new watch
   issuance is likely by 01Z.

   DISCUSSION...At 00Z, an intense thunderstorm cluster with embedded
   supercells is ongoing across northeast MN. The strongest cell within
   this cluster earlier produced baseball-size hail, damaging wind, and
   a tornado across northern MN. MLCAPE in excess of 1500 J/kg and
   effective shear of 40-50 kt will continue to support supercell
   structures as the cluster spreads southeastward, with renewed
   development possible along the southwestern flank as the low-level
   jet gradually increases this evening. 

   Some uncertainty remains regarding whether this cluster will evolve
   into a forward propagating MCS, or persist as a supercell cluster.
   In either case, a significant hail and wind threat is expected to
   spread into northwest WI this evening, with a tornado or two also
   possible if the supercell mode is maintained. A new severe
   thunderstorm watch will likely be issued for northwest WI by 01Z.

   ..Dean/Grams.. 07/27/2021

   ...Please see for graphic product...


   LAT...LON   47239444 47549316 47529205 47349131 47139072 46369045
               45779022 45809189 45839353 46159444 47229464 47239444 

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