Mesoscale Discussion 1888
   NWS Storm Prediction Center Norman OK
   0750 PM CST Tue Dec 29 2020

   Areas affected...Portions of Lower Michigan

   Concerning...Heavy snow 

   Valid 300150Z - 300545Z

   SUMMARY...Isolated areas of heavy snow possible this evening into
   the overnight. Areas of central into northern Lower Michigan may see
   slightly longer duration of snowfall rates nearing 1 in. per hour.
   Freezing rain and sleet will be possible with additional
   precipitation moving in to southern Lower Michigan by Wednesday
   morning.

   DISCUSSION...Regional radar imagery shows an area of moderate to
   heavy snow across the IL/WI border into far southwest Lower
   Michigan. This band should continue toward the north and east this
   evening into the overnight. Evening soundings from Detroit and
   Gaylord show low-level dry air that will impact snow rates
   initially. As is currently occurring in southwest Michigan,
   low-levels will rapidly moisten as the precipitation band
   approaches, leading to periods of heavy snow across central and
   southern Lower Michigan. With the main synoptic trough intensifying
   and becoming more neutrally tilted as it approaches, mid-level
   ascent should tend to increase over the northern Great Lakes.
   Furthermore, 850 mb warm advection should lessen to some degree as
   the winds at that level veer with time. Still, parts of central into
   northern Lower Michigan are likely to see the greater overlap of low
   and mid-level vertical motion allowing for greater duration of the
   heavier snow rates.

   For southern Lower Michigan, snow is expected to move out of the
   area by 1-2 AM EST. Another round of precipitation will likely move
   in by Wednesday morning. Given warming of the the profile aloft,
   freezing rain and sleet will be more likely with the early morning
   activity.

   ..Wendt.. 12/30/2020

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

   ATTN...WFO...DTX...APX...IWX...GRR...

   LAT...LON   43608658 43798657 44368636 44678565 44788498 44448428
               44018406 43728401 43198340 42638333 41808471 41458532
               41508560 41728599 41898644 41978650 42608623 43608658