Mesoscale Discussion 1863
   NWS Storm Prediction Center Norman OK
   0742 AM CST Wed Dec 23 2020

   Areas affected...eastern SD...west-central MN

   Concerning...Heavy snow 

   Valid 231342Z - 231845Z

   SUMMARY...Occasional heavier bursts of snow with rates near 1 inch
   per hour are expected to begin this morning into the midday.

   DISCUSSION...Radar mosaic shows a band of moderate to locally heavy
   snow over parts of eastern SD into far southeast ND as of 745am CST.
   Short-term models indicate this zone of heavier snow is associated
   with frontal forcing in the 850-700 mb layer.  As a mid-level
   shortwave trough over the north-central Great Plains moves eastward
   today, strengthening low- to mid-level ascent will support moderate
   to occasionally heavy snow with rates around 1 inch per hour during
   the heavier periods.  The onset of heavier snow near the MN/SD
   border is expected later this morning (10am-12pm).  Strong sustained
   winds (25-35 mph) with higher gusts and reduced visibility's within
   the heavier bursts may yield intermittent, marginal blizzard
   conditions.

   ..Smith.. 12/23/2020

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

   ATTN...WFO...MPX...FGF...FSD...ABR...

   LAT...LON   43949847 46039662 46219562 45539561 43559680 43289747
               43369809 43949847