Skip Navigation Links weather.gov 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap


 
USA.gov is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

Mesoscale Discussion 234
< Previous MD         Next MD >
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 www.spc.noaa.gov for graphic product...

   ATTN...WFO...ABR...LBF...UNR...

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

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
spc.feedback@noaa.gov
Page last modified: April 13, 2018
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities