Mesoscale Discussion 0390
   NWS Storm Prediction Center Norman OK
   0351 PM CDT Thu Apr 15 2021

   Areas affected...Northeast Colorado

   Concerning...Heavy snow 

   Valid 152051Z - 160045Z

   SUMMARY...Moderate to heavy snow, including rates up to 2 inches per
   hour, may develop near the I-76 corridor of northeast Colorado
   through 5-8 PM MDT.

   DISCUSSION...A broad mid-level low is in the process of gradually
   shifting east of the Great Basin into the Wyoming/Colorado Rockies. 
   As this continues through late afternoon and early evening,
   large-scale ascent is forecast to develop and intensify across the
   Platte Basin/Interstate 76 vicinity.  Forcing for ascent will be
   supported by strengthening lower/mid tropospheric warm advection,
   beneath increasingly difluent upper flow.  Latest model forecast
   soundings suggest lift will become maximized within and and above
   favorably cold mid-levels supportive of large dendritic ice crystal
   growth.  At the same time, near surface winds are forecast to
   gradually back to a northeasterly component, contributing to weak
   low-level cold advection.

   As this occurs, moderate to heavy snow in excess of 1 inch per hour
   appears likely to develop.  Recent runs of the Rapid Refresh have
   indicated the development of rates approaching 2 inches per hour are
   possible across an area focused around Fort Morgan, Sterling and
   Akron as early as 23-00Z.

   ..Kerr.. 04/15/2021

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

   ATTN...WFO...GLD...BOU...CYS...

   LAT...LON   40420473 40980367 41120284 40550243 39830373 39880499
               40420473