Mesoscale Discussion 0390
   NWS Storm Prediction Center Norman OK
   0129 PM CDT Thu Apr 16 2020

   Areas affected...Portions of Southeast Nebraska... Southwest
   Iowa...and far Northwest Missouri

   Concerning...Heavy snow 

   Valid 161829Z - 162230Z

   SUMMARY...Heavy snow with snow rates of 1 to 2 inches per hour
   expected to expand eastward this afternoon and evening.

   DISCUSSION...Heavy snow has begun to develop in a mesoscale band
   located along a sloping warm front from far northern Kansas into
   southern Nebraska. Surface obs in the Grand Island and Hastings
   vicinity recently reported heavy snow. Afternoon satellite imagery
   shows IR cloud tops continuing to cool as previous elevated
   convection over north Kansas expands to the north. This is supported
   by area RAP and NAM soundings which show ascent associated with 700
   and 850 mb frontogenesis and weak elevated instability with MUCAPE
   between 50 and 100 J/KG. HREF guidance indicates a favorable zone
   for snow rates of 1 to 2 inches per hour developing over southeast
   Nebraska and across the Missouri Valley during the next few hours.
   Eastward expansion of the heavier snow rates is likely as the upper
   trough over the Rockies ejects onto the plains and dendritic growth
   layer depth increases later this afternoon.

   ..Lyons/Grams.. 04/16/2020

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

   ATTN...WFO...DMX...EAX...OAX...GID...LBF...

   LAT...LON   40319930 41139989 41689877 41729731 41599479 40819415
               40359460 40159594 40149759 40319930