NWS just issued a Winter Storm Watch for the entire area beginning tomorrow (Saturday) evening and running through Sunday night. It looks increasingly likely that we’re going to have an extended period of nearly continuous snow, and the totals could get pretty impressive. As we saw last weekend there is no such thing as certainty, but as things stand right now I wouldn’t be surprised to see widespread storm totals in the 4-12” range across the entire area (including the Loop and lakefront). As shown below the northern suburbs are favored for heavier amounts, with a mix possible south of I-80 and generally lighter amounts as you go south.
Expect significant travel disruptions, especially at the airports. The good news is that most or all of Saturday should be OK before the core of the snow moves in after sunset.
I would also expect an upgrade to a full Winter Storm Warning later today or early tomorrow morning. As the models refine their guidance for snowfall totals and timing I will also send at least one update.
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