Mesoscale Discussion 1877
   NWS Storm Prediction Center Norman OK
   0542 PM CST Sun Dec 11 2016

   Areas affected...Portions of northern Illinois...northern
   Indiana...southern Lower Michigan...and far northwest Ohio

   Concerning...Heavy snow 

   Valid 112342Z - 120345Z

   SUMMARY...Localized snowfall rates up to one inch per hour will
   continue to be possible within a band of snowfall migrating eastward
   across the discussion area this evening.

   DISCUSSION...A band of moderate to locally heavy snowfall has
   organized from northern Illinois northeastward to Lower Michigan,
   with a few observations suggesting snowfall rates up to an inch per
   hour. Satellite imagery and model guidance indicate frontogenetic
   circulations (supported by modest mid-level deformation) are
   promoting this enhanced band of snowfall. While forecast soundings
   suggest a dendritic growth layer no more than 1 km deep, aggregation
   processes (depicted in KLOT Z/ZDR vertical profile data) should
   continue to favor occasional snowfall rates up to one inch per hour.
   Over the next several hours, this band should migrate eastward
   across northern Indiana, southern Lower Michigan, and far northwest
   Ohio.

   ..Picca/Cohen.. 12/11/2016


   ATTN...WFO...CLE...DTX...IWX...GRR...LOT...MKX...DVN...

   LAT...LON   41428706 41338898 41408919 41728921 42068880 42488795
               42678757 43438615 43548515 43318411 42808326 42168316
               41358384 41418547 41428706