Snow

Most of the area is under a WWA for some snow tomorrow. This would not normally be a big deal, but given that it's Christmas Eve there could be some travel disruptions (especially on the roads) that are worth noting. 

Snow will overspread from the south and west overnight toward dawn. Light snow is likely in most areas from sunrise through early/mid-afternoon. Again, this is NOT a strong storm. There is plenty of cold air in place -- so any snow that does fall will be light and fluffy -- but there is little moisture and little lift. I would take the under on most of the numbers I'm seeing, but far southern suburbs could see several inches (and lake-prone areas in NW Indiana could see a half foot or more). The city and most suburbs could see a dusting up to 2-3 inches; the low end would see flakes in the air but no accumulation, while the high end would certainly be enough to whiten the roads and slow down travel. The northern suburbs could see an inch or two but may well see no accumulation at all. 

Again, I would only be concerned if traveling into NW Indiana or SW Michigan (where a full Winter Storm Warning is in effect). Southbound drives on I-55/-57/-65 are also going to be slow. Within the Chicago area roads are going to be slower but unlikely to see major disruptions. Given the heavy volumes O'Hare and Midway might see some delays but major impacts are hard to imagine. 

As for the all-important White Christmas math...it's a tough call. South of I-55 I would say it's a good bet, starting at 60% and adding 10% for every 50 miles south. In the city it's about a coin flip -- there might not be much accumulation, and what does stick may be gone by Monday morning. The northern burbs are looking iffy at best. 

Beyond this little snow it will be cold but sunny on Christmas, with even colder weather into the middle part of the week. After that a potential storm on Thursday/Friday is worth monitoring. (Note that a legit snow storm before Sunday would be just enough to keep us from the all-time least snowy calendar year on record at Midway! Records there began in 1928-29.)

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