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Mesoscale Discussion 111
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   Mesoscale Discussion 0111
   NWS Storm Prediction Center Norman OK
   0116 AM CST Sun Feb 09 2020

   Areas affected...East-Central SD...Southern MN...North-Central IA

   Concerning...Heavy snow 

   Valid 090716Z - 091215Z

   SUMMARY...A band of heavy snowfall with rates from 1" to 2" per hour
   will gradually shift eastward across east-central SD, southern MN,
   and far north-central IA over the next few hours.

   DISCUSSION...Recent mesoanalysis reveals a broad low-level jet
   extending from central TX into far southeast SD/far northwest IA.
   This low-level jet is contributing to strong warm-air advection and
   low to mid-level frontogenesis from southeast SD eastward across
   much of IA. This strong mesoscale forcing for ascent has resulted
   the development of a band of heavy snowfall (i.e. snowfall rates at
   or above 1" per hour). Regional radar imagery shows this band
   extending from east-central SD southwestward across southern MN and
   into far northern IA. 

   Expectation is for this band to gradually shift eastward over the
   next several hours in step with mid-level trough responsible for the
   low-level jet. Snowfall rates above 1" per hour will be common
   within this band, with instances of rates near 2" per hour also
   possible.

   ..Mosier.. 02/09/2020

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

   ATTN...WFO...ARX...MPX...DMX...FSD...ABR...

   LAT...LON   43719587 44319832 44919735 45079602 44799441 44479342
               44029288 43669284 43189332 43359484 43719587 

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Page last modified: February 09, 2020
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