Mesoscale Discussion 1127
   NWS Storm Prediction Center Norman OK
   1256 AM CDT Tue Jul 07 2020

   Areas affected...Southern South Dakota...Northern Nebraska

   Concerning...Severe Thunderstorm Watch 336...

   Valid 070556Z - 070745Z

   CORRECTED FOR WORDING LAST SENTENCE

   The severe weather threat for Severe Thunderstorm Watch 336
   continues.

   SUMMARY...A wind-damage and isolated large hail threat will likely
   continue across southern South Dakota for several more hours. The
   threat may impact northern Nebraska as the storms move to the
   southeast. A new weather watch to the south of WW 336 will be
   considered.

   DISCUSSION...Latest radar analysis shows a well-developed bowing
   line segment across southern South Dakota. A warm-advection wing of
   convection extends east-southeastward int southeastern South Dakota.
   The developing MCS is located along the northern edge of moderate
   instability with the RAP estimating MLCAPE near 1500 J/kg. In
   addition, a 30 to 40 kt low-level jet is analyzed across western and
   northern Nebraska. This jet along with the instability will help
   maintain the storms for several more hours. This line will move
   southeastward toward drier air left over from this evening's
   convection in northern Nebraska. For this reason, uncertainty exists
   concerning how long the severe threat will be maintained. The
   current thinking is that the greatest severe threat will be confined
   to southern South Dakota where surface dewpoints are greater,
   however the isolated severe threat may gradually shift into northern
   Nebraska

   ..Broyles/Edwards.. 07/07/2020

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

   ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...

   LAT...LON   43150130 42830121 42440039 41969908 41669815 41699765
               41909723 42109707 42359703 42579706 43129755 43769844
               43999903 43959996 43510086 43150130