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Mesoscale Discussion 59
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   Mesoscale Discussion 0059
   NWS Storm Prediction Center Norman OK
   0632 AM CST Fri Jan 17 2020

   Areas affected...Portions of eastern NE...western/central
   IA...central/eastern SD...and southwestern MN

   Concerning...Heavy snow 

   Valid 171232Z - 171800Z

   SUMMARY...Moderate to heavy snowfall, with rates around 1 inch per
   hour, will develop and then spread northeastward this morning.

   DISCUSSION...Within large-scale upper troughing over much of the
   western/central CONUS, a lead shortwave trough will continue to
   eject northeastward this morning across the central Plains and
   towards the Upper Midwest. The 12Z sounding from Omaha NE shows
   strong southerly winds in the 925-700-mb layer. This low-level warm
   advection and additional large-scale ascent preceding the shortwave
   trough are promoting a broad area of precipitation this morning
   across parts of the southern/central Plains. From roughly the NE/KS
   border northward, the low-level thermodynamic profile should remain
   cold enough to support snow as the dominant precipitation type.
   Strong lift is forecast to occur through 18Z in the dendritic growth
   zone from eastern NE into parts of western/central IA,
   central/eastern SD, and southwestern MN. Light to locally moderate
   snow ongoing across central/eastern NE and vicinity is likewise
   expected to increase in intensity through the remainder of this
   morning as this broad area of snow shifts northeastward. Snowfall
   rates around 1 inch per hour appear likely by 15Z over parts of this
   region, with locally higher rates possible through 18Z within the
   most intense portion of the snow band.

   ..Gleason.. 01/17/2020

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

   ATTN...WFO...MPX...DMX...FSD...OAX...ABR...GID...LBF...

   LAT...LON   43029367 41939304 41329266 40919287 40719342 40659445
               40599578 40639680 41019737 41549798 42079861 42539919
               42989948 43759950 44679863 45509701 45559549 44889450
               44019380 43029367 

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