SPC MD 234

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MD 0234 CONCERNING HEAVY SNOW FOR THE SOUTHWEST QUARTER OF SOUTH DAKOTA AND VICINITY
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  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 www.spc.noaa.gov for graphic product...  ATTN...WFO...ABR...LBF...UNR...  LAT...LON   43960323 44600323 44970280 45170202 44229987 43180019             42870161 42970263 43380317 43960323   

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