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Mesoscale Discussion 234
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MD 234 graphic

   Mesoscale Discussion 0234
   NWS Storm Prediction Center Norman OK
   0452 AM CDT Fri Apr 13 2018

   Areas affected...the southwest quarter of South Dakota and vicinity

   Concerning...Heavy snow 

   Valid 130952Z - 131545Z

   SUMMARY...Snowfall rates locally in excess of 1"/hr near the Black
   Hills should expand eastward with time across a larger portion of
   the southwest South Dakota Vicinity.

   DISCUSSION...Latest surface obs show gradually cooling temperatures
   across the discussion area, with what appears to be melting-enhanced
   cooling in the Black Hills area (the temperature fell to a now
   steady 32 degrees at Rapid City over the past couple of hours). 
   Persistent moderate to heavy snowfall is indicated by radar within a
   deformation zone across the Black Hills area, with rainfall farther
   south and east where temperatures remain in the mid to upper 30s.

   However, as the slow-moving upper system drifts eastward, continued
   gradual cooling/persistent precipitation across a larger portion of
   southwest South Dakota should result in an eastward expansion of
   substantial snowfall -- in line with latest model output.  Strength
   of ascent across the region -- and possibly some convective
   enhancement -- suggests snowfall rates exceeding 1" per hour can be
   expected over the next several hours.

   ..Goss.. 04/13/2018

   ...Please see for graphic product...


   LAT...LON   43960323 44600323 44970280 45170202 44229987 43180019
               42870161 42970263 43380317 43960323 

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