Mesoscale Discussion 1045
   NWS Storm Prediction Center Norman OK
   0809 PM CDT Sun Jun 28 2020

   Areas affected...Northwest SD

   Concerning...Severe Thunderstorm Watch 313...

   Valid 290109Z - 290215Z

   The severe weather threat for Severe Thunderstorm Watch 313
   continues.

   SUMMARY...Large hail and isolated severe wind gusts are possible
   across northwest South Dakota this evening.

   DISCUSSION...Deep convection that formed over northeast WY has
   progressed across the northern Black Hills and has produced isolated
   measured severe wind gusts along with hail in excess of 1 inch.
   Substantial outflow is racing east-southeast ahead of this
   convection while the primary core of storms is moving east-northeast
   at roughly 35-40kt. Current speed/movement of this activity suggests
   the leading edge will exit ww313 shortly into the western portions
   of ABR CWA. With LLJ expected to increase across western SD over the
   next few hours there is concern these storms may spread at least
   100mi downstream with some threat of severe. New ww may be required
   to account for this scenario.

   ..Darrow.. 06/29/2020

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

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

   LAT...LON   44550250 45730275 46030001 44829991 44550250