(11:45PM – Thursday, March 6th, 2025) Thursday night update on a weakening storm system that will move through the region, with an area of precipitation that will accompany it and traverse the state. Of note will be a period of snow across roughly the northern 1/3rd of the state, between tonight and Friday night.
Timing…
•Tonight – Friday Night, March 6-7th.
Location…
•Northern & Central Illinois.
Impacts…
•Snow accumulation ranging from a dusting to 1-3″ will be likely across affected areas.
•With marginal temperatures during this event… Snowfall will be heavy/wet, compacting/melting will occur during the event and greatest snowfall accumulation will be on colder surfaces.
•Banding will be likely in the snowfall corridor, with a period of moderate to heavy snowfall possible.
Update…
•With this update, no little to no changes were needed, as the going forecast is on track.
Discussion…
•As a storm system moves through the region, it will be in a steadily weakening/dampening phase. Even with that, precipitation accompanying it will traverse the state. Of focus will be roughly the northern 1/3rd of the state, where a period of snow will be likely. While temperatures will be marginal, and likely hovering around or just above freezing for the duration of the event, dynamic cooling will help to keep precipitation in the form of snow. Weather guidance and associated soundings are favorable for banded snowfall, and a period of moderate to heavy snowfall in a corridor within the main larger snowfall axis. While snowfall accumulation as a whole will be minor overall across affected areas, greatest accumulations will be where the peak of this banding occurs. With marginal temperatures expected, snow will be compacting/melting during this event. Thus, this is one of those situations where more snow will fall than it accumulates in total. These marginal temperature conditions also means greatest snowfall accumulation will occur on colder surfaces.
