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Mesoscale Discussion 1220
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   Mesoscale Discussion 1220
   NWS Storm Prediction Center Norman OK
   0821 PM CDT Fri Jul 09 2021

   Areas affected...Central/eastern Nebraska

   Concerning...Severe Thunderstorm Watch 356...

   Valid 100121Z - 100315Z

   The severe weather threat for Severe Thunderstorm Watch 356
   continues.

   SUMMARY...As activity in WW 356 increase, storms will continue to
   move east into a strongly unstable airmass. A new downstream WW is
   likely by 02Z for parts of eastern Nebraska.

   DISCUSSION...Convection has increased along the cold front in
   central Nebraska with a small line segment also developing farther
   east of earlier supercells in western Nebraska. As this activity
   continues to the east, driven by lift associated with the low-level
   jet as well as an approaching shortwave, storms will encounter a
   strongly unstable environment sampled by the 00Z OAX sounding.
   Effective bulk shear of 50-55 kts will favor storm organization,
   though the mode is likely to be predominantly linear. As such,
   severe wind gusts are expected to be the primary threat, though
   mid-level lapse rates would favor large hail in any more discrete
   storms.

   Activity in southern South Dakota has also increased over the last
   hour. These storms are forming in an environment that has remained
   cooler. These multicell storms may produce large hail, but will
   similarly congeal as they move toward the southeast where better
   buoyancy exists.

   A new WW downstream is likely by 02Z.

   ..Wendt.. 07/10/2021

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

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

   LAT...LON   42250183 42640119 43010081 43180021 43219914 42889762
               42159642 41129652 40419691 40199738 40439892 40940013
               41130114 41530219 42010243 42250183 

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