Storm Prediction Center Mesoscale Discussion 74

   Mesoscale Discussion 0074
   NWS Storm Prediction Center Norman OK
   0514 PM CST Fri Feb 07 2025

   Areas affected...southern ND vicinity

   Concerning...Heavy snow 

   Valid 072314Z - 080315Z

   SUMMARY...Narrow, transient bands of heavy snowfall rates around 1
   inch per hour should persist through the mid-evening hours across
   the southern North Dakota vicinity, potentially impacting areas
   along and south of the I-94 corridor.

   DISCUSSION...Per recent reports from WFO BIS/FGF and observational
   imagery, a thin band of heavy snow has been ongoing across a portion
   of southern ND, which the bulk of daytime guidance was underdone
   with. This snow band appears to be associated with an arc of
   maximized low-level isentropic ascent amid a rather cold
   thermodynamic profile supporting high snow-to-liquid ratios. Forcing
   for ascent above the dendritic growth zone will overspread some of
   this same corridor into mid evening as a mid-level shortwave impulse
   over southeast MT shifts east. This should maintain favorable
   large-scale lift and may aid in producing additional narrow bands
   towards the SD border area. This scenario is supported by a relative
   increase in heavy snow potential from 12Z HREF and 15Z SREF winter
   guidance.

   ..Grams.. 02/07/2025

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

   ATTN...WFO...FGF...ABR...BIS...UNR...

   LAT...LON   46480233 46740075 46799757 46439645 46109649 45809715
               45720016 45520178 45590262 46480233