Snowvember rolls on after a brief shot of mild air yesterday and today, and we've just been upgraded to a Winter Storm Watch tomorrow (Sunday). This storm has been monitored for days, but it is really coming together and tracking south of its original projection.
With temps pushing 50 today it may not feel like winter, but our exceptionally cold November will return tomorrow after morning temps near 40 start to slide and rain changes to snow. Winds will also be an issue, gusting to 30-40+ and causing visibility issues (especially in open areas). Snow will be heaviest to the west, and totals will decrease rapidly from northwest to southeast. There is a good chance of 6+ inches far west toward DeKalb, while areas in Chicago -- especially near the lake -- will see far less accumulation. For now, I'd put the 50% probability total at 4-6 inches in far NW and N suburbs; 3-4 inches at O'Hare; 1-3 inches at Midway and Loop; and a trace to 1" far S and SE. Some projections are already up to 6-9" NW and 3-6" right through the city, but I'll take the under on that for now. It is still early, the track has been shifting, and as with all early-season storms the bust potential is significant. I will send an update tonight or tomorrow morning as details come together.
Especially at the onset of the rain-to-snow transition the snow will be heavy and wet. Warm surface temps should help it melt at first, but heavy snowfall rates will likely overwhelm road crews by mid-/late-afternoon, causing at least some problems on the roads. The timing in general is terrible given the busy travel schedule on the Sunday after Thanksgiving. Air travel will see delays given that heavy snow will be impacting areas from the central Rockies to the Upper Midwest. Chicago airports Driving west, especially through western Illinois, Iowa, and northern Missouri, is going to be problematic.
The good news is that the snow should end overnight, so hopefully roads will be clear and travel will be OK but the Monday morning rush. It will be cold, though, with near-record temperatures
Note: this is old and the Winter Storm Watch has been extended to the west and south to include Chicago.
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