Mesoscale Discussion 1334
   NWS Storm Prediction Center Norman OK
   0728 PM CDT Fri Jul 24 2020

   Areas affected...Southern and Eastern North Dakota...Central South
   Dakota...North-central Nebraska

   Concerning...Severe Thunderstorm Watch 399...400...

   Valid 250028Z - 250230Z

   The severe weather threat for Severe Thunderstorm Watch 399, 400
   continues.

   SUMMARY...A severe threat will likely continue across parts of WW
   399 and WW 400. Hail and wind damage will be the primary threats.

   DISCUSSION...The latest mosaic radar imagery shows two areas of
   strong to severe convection. The first is located from north-central
   South Dakota into east-central North Dakota. The storms are located
   along a gradient of strong instability. This activity will move
   northeastward along the instability gradient into northeastern North
   Dakota later this evening. The second area of thunderstorms is
   located from southern South Dakota into north-central Nebraska. This
   southern area of convection is also located along a gradient of
   strong instability. This activity is expected to move eastward
   across north-central Nebraska and east-central South Dakota over the
   next few hours. 

   Both areas have deep-layer shear that appears marginal for
   supercells. For this reason, hail sizes should remain close to one
   inch in the more intense updrafts. But as multicell line segments
   organize in areas where the strong instability and steep low-level
   lapse rates are present, wind damage will be possible. The greatest
   wind-damage threat should occur along the leading edge of any
   intense short line segment.

   ..Broyles.. 07/25/2020

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

   ATTN...WFO...FGF...FSD...ABR...BIS...LBF...UNR...

   LAT...LON   47949874 47329966 46720034 45930114 45050142 43440113
               43100117 42450116 41800082 41689963 41919907 42949885
               44389885 45329866 46609788 47619746 47949874