Mesoscale Discussion 1177
   NWS Storm Prediction Center Norman OK
   0631 PM CDT Fri Jul 10 2020

   Areas affected...Southwestern SD...North-Central NE

   Concerning...Severe Thunderstorm Watch 352...

   Valid 102331Z - 110130Z

   The severe weather threat for Severe Thunderstorm Watch 352
   continues.

   SUMMARY...Severe threat will spread across southwestern SD into
   north-central NE later this evening.

   DISCUSSION...Long-lived cluster of severe thunderstorms that
   developed over southeast MT has tracked across the Black Hills and
   is moving southeast at roughly 30kt. Air mass ahead of this
   convection is quite unstable along a corridor from south-central SD
   into north-central NE. This activity appears to be aided by a
   short-wave trough currently located along the MT/ND border. As
   mid-level flow turns more northwesterly, convection across the
   western Dakotas should begin to turn more southeast and propagate
   along the aforementioned instability axis. It appears the leading
   edge should approach Cherry County NE by 0130z. At that time, a new
   watch may be needed to account for severe spreading into Nebraska.

   ..Darrow.. 07/10/2020

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

   ATTN...WFO...ABR...LBF...UNR...

   LAT...LON   44510226 43910073 43060005 42490108 43120252 44030343
               44510226