We continue to eye the threat of accumulating snow across portions of northern Illinois, beginning tonight and through Wednesday morning and coming in what looks like two separates waves. This will not be a continuous event or a big snow maker and there will be fairly large breaks in the snow but several smaller disturbances passing through the Midwest will lead to increased chances for snow and snow that could accumulate across portions of northern Illinois.
I dig into the latest below, including trying to pin down the timing of these several waves of snow....
Latest high resolution model guidance continues to suggest that snow will develop over portions of northern Illinois late tonight and overnight, possibly snowing into the early morning hours. This developing snow will be associated with an area of frontogenesis aloft, leading to a narrow band of snow. There could also be some lake effect snow showers across northeast Illinois tomorrow morning. The loop below runs from 9pm this evening till 11am tomorrow.
The area outlined in orange below stands the best chance for a dusting to possibly just over an inch of snow by tomorrow morning.
The next bout of possible snow will come tomorrow evening/late tomorrow night brought on by a period of warm air advection and isentropic lift. Model guidance continue to differ some on the placement of this band of snow with some keeping it across northern Illinois while other guidance has it further north into Wisconsin.
Below is our current thought on expected snowfall totals between both periods of snow....the one late tonight into tomorrow morning and the second one tomorrow evening and late tomorrow night. Each of these will have the potential to produce a half inch to 1.5" of snow, most likely in a fairly narrow band. Right now, we are favoring far northern Illinois for the highest totals.
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