Mesoscale Discussion 1909
   NWS Storm Prediction Center Norman OK
   0633 PM CST Sun Dec 25 2016

   Areas affected...much of western and central ND into western SD

   Concerning...Heavy snow 

   Valid 260033Z - 260630Z

   SUMMARY...Heavy snow and blizzard conditions will continue tonight
   across western South Dakota into western and central ND.

   DISCUSSION...Heavy snow, with rates near 1 in/hr and blizzard
   conditions at times, will continue for several hours tonight on the
   cold side of the northeastward advancing surface cyclone and
   mid-to-upper level shortwave trough over the central Plains. Point
   forecast soundings maintain a deep saturated vertical profile with
   strong forcing for ascent associated with the northeastward ejecting
   central Plains trough through at least 06z. During this time,
   dendritic growth zone depth greater than 10 kft will be favorable
   for efficient snow production and snowfall rates could exceed 1
   in/hr for brief period. Furthermore, surface wind speeds will
   increase in the 03-06z time frame from southwest to northeast across
   the MCD area to around 20-30 mph with gusts as high as 50 mph
   possible from western SD into central ND, creating blizzard
   conditions.

   ..Leitman.. 12/26/2016


   ATTN...WFO...FGF...ABR...BIS...UNR...

   LAT...LON   49269849 49139739 48939714 48619725 46879985 46320043
               45240119 44370167 43900221 43680269 43780376 44290406
               46660374 47410353 47920336 48440296 48910225 49190125
               49300000 49269849