Mesoscale Discussion 1102
   NWS Storm Prediction Center Norman OK
   0738 PM CDT Sat Jul 04 2020

   Areas affected...northeast SD

   Concerning...Severe Thunderstorm Watch 328...

   Valid 050038Z - 050145Z

   The severe weather threat for Severe Thunderstorm Watch 328
   continues.

   SUMMARY...Isolated large hail and severe gusts are possible with a
   thunderstorm cluster over northeast SD for the next few hours.

   DISCUSSION...Radar imagery shows a southward-moving cluster of
   thunderstorms north of Aberdeen as of 730pm CDT.  The 7pm CDT
   observed sounding from Aberdeen shows a moist boundary layer (14.5
   g/kg mean mixing ratio) and around 2800 J/kg MLCAPE.  Although flow
   in the mid to high levels is modest, gradual veering of southerly
   low-level flow to westerly in the mid levels, has contributed to
   effective shear around 25 kt---marginally supportive for supercells.
   Expecting a continued risk for severe hail/wind over the next few
   hours with this cluster before weakening occurs in tandem with
   gradual boundary layer stabilization.

   ..Smith.. 07/05/2020

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

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

   LAT...LON   45869989 46059884 45589802 45159834 45219960 45869989