Mesoscale Discussion 1775
   NWS Storm Prediction Center Norman OK
   1027 AM CST Sun Nov 08 2020

   Areas affected...Central/Eastern MT

   Concerning...Heavy snow 

   Valid 081627Z - 082130Z

   SUMMARY...Heavy snowfall and potential blizzard conditions are
   expected to continue eastward from central into eastern MT this
   afternoon.

   DISCUSSION...Recent regional radar imagery and surface observation
   show a large area of moderate to occasionally heavy snowfall from
   central into eastern MT. A surface low is centered just east of the
   MT/SD/ND border intersection, with an associated frontogenetic band
   across northeast MT contributing to the heaviest precipitation
   currently. Given the higher radar reflectivity and lower correlation
   coefficient within this band, some melting into freezing rain at the
   surface may be currently ongoing. However, with the continued cold
   advection as well as persistent frontogenesis, which will be
   augmented by ascent attendant to the approaching shortwave trough,
   the expectation is for a band of heavy snow to develop from roughly
   HVR (in Hill County MT) southeastward to MLS (in Custer County MT)
   over the next few hours. Snowfall rates for 1" to 2" per hour are
   possible, with rates likely maximized between 18 and 21Z. 

   In addition to this heavy snowfall, wind gusts across central MT
   have generally been around 25 to 30 kt, which is very near blizzard
   criteria. These gusty winds are expected to continue eastward into
   more of northeast and east-central MT, resulting in the potential
   for blizzard conditions this afternoon.

   ..Mosier.. 11/08/2020

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

   ATTN...WFO...BYZ...GGW...TFX...

   LAT...LON   46930940 48071029 49061020 49010753 47090528 45740590
               45970760 46930940