Mesoscale Discussion 1126
   NWS Storm Prediction Center Norman OK
   0907 PM CDT Mon Jul 06 2020

   Areas affected...western through central South Dakota

   Concerning...Severe Thunderstorm Watch 334...

   Valid 070207Z - 070330Z

   The severe weather threat for Severe Thunderstorm Watch 334
   continues.

   SUMMARY...Threat for damaging wind and large hail will persist
   through about 04Z across a portion of western South Dakota. Farther
   east additional storms may develop, and also the line of storms will
   begin to move east of WW 334 after 03Z. While a downstream WW into
   central SD is uncertain, issuance will ultimately depend on
   convective trends.

   DISCUSSION...As of mid evening, a line of storms continues moving
   through western SD at 30-35 kt. A comma head structure was observed
   on the northern end of the line, while a supercell producing large
   hail remains on the southern end, but storms in between are
   beginning to struggle. While the downstream atmosphere remains
   moderately unstable, surface-based convective inhibition is
   increasing which will serve as a liming factor. Nevertheless, a
   nocturnal low-level jet is developing, which along with the
   organized structures embedded within the line, may help to sustain
   storms into central SD. Other warm advection storms may also develop
   ahead of the line. Given competing forces for storm maintenance, the
   longer-term severe threat remains uncertain, but storms will
   continue to pose a risk for damaging wind and large hail next couple
   hours.

   ..Dial.. 07/07/2020

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

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

   LAT...LON   44220274 44690225 45150200 44990067 44589898 43889922
               43550018 43160160 43170257 43620305 44220274