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Mesoscale Discussion 347
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   Mesoscale Discussion 0347
   NWS Storm Prediction Center Norman OK
   0626 AM CDT Sun Apr 12 2020

   Areas affected...Parts of northeastern Nebraska...southeastern South
   Dakota...northwestern Iowa and southwestern Minnesota

   Concerning...Heavy snow 

   Valid 121126Z - 121530Z

   SUMMARY...A band of heavy snow is expected to develop across the
   region this morning, with rates of 1-2 inches per hour increasingly
   likely by 9-11 AM CDT.

   DISCUSSION...As upstream mid-level troughing gradually pivots into
   the northern High Plains, models indicate that lower/mid
   tropospheric frontogenetic forcing will intensify through 12-16Z
   across the middle Missouri Valley.  It appears that this will also
   coincide with increasing upper divergence within the right entrance
   region of a high-level jet, to support strengthening deep-layer
   lift, including through the layer favorable for large dendritic ice
   crystal growth, within at least a narrow corridor across
   northeastern Nebraska into southwestern Minnesota.  Thermodynamic
   profiles across this region are already generally entirely below
   freezing, with gusty post-frontal surface winds beneath a 30-40 kt
   north-northeasterly 850 jet contributing to continuing low-level
   cold advection.  Supported by precipitable water on the order of .5
   to .7 inches, sustained heavy snow rates of 1 to 2 inches per hour
   appear possible for a several hour period this morning.

   ..Kerr.. 04/12/2020

   ...Please see for graphic product...


   LAT...LON   42989820 44269545 44279459 43729446 43149610 41849914

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