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Mesoscale Discussion 61
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   Mesoscale Discussion 0061
   NWS Storm Prediction Center Norman OK
   0907 PM CST Thu Feb 08 2018

   Areas affected...Portions of IA...southern WI...and northern IL

   Concerning...Heavy snow 

   Valid 090307Z - 090900Z

   SUMMARY...A narrow band of moderate to heavy snow will likely
   produce snowfall rates around 1 inch per hour through the early
   morning.

   DISCUSSION...A low-amplitude shortwave trough present over NE/KS
   will move eastward across the Upper Midwest overnight. Large-scale
   lift ahead of this trough has promoted a broad area of light to
   moderate snow extending from eastern SD to southern WI/northern IL.
   A strengthening southwesterly low-level jet across southern IA is
   focusing a low-level baroclinic zone across central IA as of 03Z.
   Related frontogenetic forcing should remain centered around 850 mb,
   and a narrow west-to-east oriented band of moderate to heavy snow
   has recently developed across central IA on the nose of the
   low-level jet. Snowfall rates around 1 inch per hour in this band
   will likely occur through the remainder of the evening and continue
   through the overnight hours. As the shortwave trough develops
   eastward, the moderate to heavy snow band will shift eastward into
   southern WI and northern IL (including the Chicago metro), mainly
   after 05Z.

   ..Gleason.. 02/09/2018

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

   ATTN...WFO...LOT...MKX...DVN...ARX...DMX...FSD...OAX...

   LAT...LON   41999517 42069591 42389617 42759576 42939447 43079144
               42958858 42758768 42318769 41838750 41328771 41358837
               41669002 41859140 41949291 42029446 41999517 

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Page last modified: February 09, 2018
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