Mesoscale Discussion 1957
   NWS Storm Prediction Center Norman OK
   0422 AM CST Sun Dec 05 2021

   Areas affected...central and northeastern Minnesota into northern
   Wisconsin/western Upper Michigan

   Concerning...Heavy snow 

   Valid 051022Z - 051615Z

   SUMMARY...A band of moderate to heavy snowfall will shift gradually
   eastward and northward across central and northeastern Minnesota,
   northern Wisconsin, and into western Upper Michigan.  Rates
   exceeding 1" per hour are expected in heavier bands.

   DISCUSSION...A mid-level vort max -- now crossing southern and
   eastern North Dakota per water vapor imagery -- is forecast to dig
   east-southeastward with time.  As this occurs, a north-northwest to
   east-southeast zone of warm advection/isentropic ascent will
   persist, as southerly low-level flow near 50 kt shifts eastward
   across the upper Mississippi Valley region through midday.  This
   ascent will allow a band of moderate to heavy snowfall -- currently
   ongoing from north-central North Dakota to east-central Wisconsin --
   to continue.  With time, the band is expected to drift slowly
   northward, focusing from central/northeastern Minnesota to northern
   Wisconsin/western Upper Michigan through late morning.  As this
   occurs, some increase in intensity of the band is expected,
   corresponding with some enhancement in snowfall rates with time. 
   Within the heaviest portions of the band, snowfall rates in the 1"
   to 1 1/2" per hour range are expected.  As the upper system
   advances, a gradual west-to-east shift of the area of heaviest
   snowfall is expected, tapering with time across North Dakota, and
   spreading across Lake Michigan toward northern Lower Michigan
   through late morning.

   ..Goss.. 12/05/2021

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

   ATTN...WFO...MQT...GRB...DLH...ARX...MPX...FGF...

   LAT...LON   47329481 47759350 47889178 47819051 47178983 46218744
               45528718 45068746 44908945 45539075 46569332 46669485
               47329481