National Weather Service United States Department of Commerce

An area of moderate to heavy snow moved northeastward across northern Illinois and far northwest Indiana during the late afternoon and early evening of Tuesday, December 29th. Snowfall rates of 1" to locally 2" per hour were observed this this band of snow. By mid-evening, warming temperatures aloft resulted in the precipitation mixing with sleet and rain before changing over to all rain for much of north-central and northeast Illinois by late in the evening. Air temperatures remained below freezing for several hours after the switch to rain, resulting in ice accumulations of 0.1"-0.2" for much of northeast Illinois late Tuesday evening into early Wednesday morning.

This was the first significant winter precipitation event this season for most of the NWS Chicago forecast area with the exception of locations near the Wisconsin state line. The high snowfall rates during the late afternoon and evening resulted in major travel disruptions across northern Illinois and the Chicago metro.

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