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Mesoscale Discussion 33
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   Mesoscale Discussion 0033
   NWS Storm Prediction Center Norman OK
   0354 PM CST Sun Jan 21 2018

   Areas affected...Portions of eastern CO...northwestern KS...and
   southwestern into central NE

   Concerning...Blizzard 

   Valid 212154Z - 220400Z

   SUMMARY...Increasing snowfall rates (up to 1 inch per hour), strong
   northerly winds, and reduced visibilities due to blowing snow will
   likely result in areas of blizzard conditions through this evening.

   DISCUSSION...A vigorous upper trough/low centered over eastern CO
   this afternoon will eject eastward across the central Plains this
   evening. Strong large-scale forcing for ascent associated with this
   upper trough/low will become increasingly focused across eastern CO,
   northwestern KS, and parts of southwestern into central NE over the
   next few hours. Related low-level frontogenesis will strengthen
   across this region by 00Z, and a developing deformation band of
   moderate to heavy snow should align in a generally
   southwest-to-northeast corridor. Snowfall rates up to 1 inch per
   hour will become increasingly likely after 00Z, and should continue
   through the evening hours as this band shifts slowly
   east-northeastward in tandem with the upper trough/low progression.
   Locally higher rates may occur within the strongest portions of this
   band. The surface pressure gradient is forecast to further
   strengthen this evening across this region as a low consolidates and
   deepens over central/eastern KS. Sustained northerly to
   northwesterly winds around 30 mph with frequent gusts exceeding 40
   mph will be common, which combined with the moderate/heavy snow will
   likely result in greatly reduced visibilities and areas of blizzard
   conditions.

   ..Gleason.. 01/21/2018

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

   ATTN...WFO...GID...LBF...GLD...BOU...

   LAT...LON   39430008 38880095 38660191 38710276 39420299 40080286
               40510262 41250182 41620114 41760052 41719962 41389923
               40649923 40009957 39430008 

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Page last modified: January 22, 2018
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