The first major winter storm of the season will continue to impact parts of northern Illinois and northwest Indiana today into Wednesday. Check the latest forecast before making travel plans, and check back frequently for updates.
Light snow this morning will end by noon across the northern suburbs and counties near the Wisconsin state line. Additional snow currently across parts of Nebraska and Kansas will quickly move into the area late this afternoon and early this evening. As this snow moves in, temperatures in the lowest 3000 feet of the atmosphere, as well as at the surface, are expected to rise above freezing for a time this evening and during the overnight hours. As this takes place, snow will mix with sleet and rain for a short time this evening, and then transition to all rain along and south of I-88 in Illinois late this evening and overnight. Along with this change to rain, a few rumbles of thunder will also be possible. North of I-88, a change to a mix of snow, sleet, and rain will be possible for a short time during the late evening and overnight hours.
Currently, there is significant uncertainly regarding exactly where the rain/snow line will set up, but at this time, it appears that the best potential for precipitation remaining all snow will be across areas to the north of I-88 and west of I-39. The transition to mixed precipitation and rain will result in much lower snow accumulations across those areas that change to rain; please see the latest map of expected snowfall totals below.
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As this very strong storm system lifts northeast early Wednesday morning, temperatures are expected to quickly drop below freezing during the mid morning hours, changing any remaining precipitation back to all snow, though no significant additional accumulation appears likely. Along with the drop in temperatures, winds are expected to rapidly increase during the morning hours, with northwest wind gusts in excess of 35 mph possible. For those areas that receive several inches of snow today and tonight, these gusty winds could result in periods of near blizzard conditions for a period on Wednesday.
Please be sure to check back to this webpage, NOAA Weather Radio, and local media for any changes to the current forecast, as well as current watches, warnings, and advisories.