It's not very often the atmosphere lines up enough to feed some lake effect snow showers as far West as Rockford, but we may get a few spotty snow showers this direction Friday. Late morning through early evening will be the main timing, centered around mid-day. The best chances for any lake effect snow will be mostly East of I-39, with higher chances toward the Lake. Total accumulations may amount to a half inch or even up to an inch where snow is the steadiest. Locations West of I-39 may only be able to pick up a dusting at most.
Initial bands of lake effect snow showers will work inland off Lake Michigan as early as 6-7AM, then push into parts of Walworth (WI) and McHenry Counties after 9AM. At first, the snow may be quite intense closer to the lake but will weaken substantially with Westward movement.
Most of the lake effect bands will be scattered in nature this far West, with most in the area remaining dry at any given time. Those who see any pockets of snow showers move in may experience a rapid drop in visibility and a quick coating of snow on the roadways. North-northeast wind gusts of 20-25 mph may cause some blowing snow as well. The main window for lake effect snow is centered around mid-day, between 11AM-3PM.
By 5-6PM, the band of snow showers will have weakened, with only a few light snow showers or flurries remaining in place. We will keep some patches of clouds through the night, but temperatures will again drop back to the single digits with subzero wind chills.
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