NWS has just upgraded the whole area (except for far southern areas) to a Winter Storm Warning. This is a marginal storm but it may present some problems tomorrow morning.
Overnight toward dawn an area of snow and freezing rain will spread north. Snow totals will be light (1-3") in a few affected areas, but there could be an accumulation of ice. And is VERY tough to forecast freezing rain. A difference of just 1-2 degrees at the surface could lead to all snow, all freezing rain, or a mix. I think warm lake waters and ground in the city will lead to minimal snow and ice accumulations in the city and most of Cook County. But areas west and north could see meaningful ice as well as some snow. Pre up should switch to rain tomorrow morning into the afternoon, and by the evening commute things look better. Very high winds (40-50 mph) could lead to lakeshore flooding, isolated power outages, and flight delays.
Temps will be seasonal this week -- mostly 20s and 30s, sliding about 10 degrees into the first genuinely wintry air by New Year's Day.
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