Winter Weather Advisory issued for freezing rain and snow Monday night/Tuesday morning

 

A WINTER WEATHER ADVISORY has been issued for all of northern Illinois and southern Wisconsin for a combination of freezing drizzle/rain Monday evening and overnight, mixing in with wet snow Tuesday morning.

The start and end times of the advisory vary depending on where you live within the Stateline, but road conditions are likely to become slick through the overnight Monday and into Tuesday morning. This will have some impacts on Tuesday morning's commute.

Freezing drizzle has already been reported across northern Illinois, even though it isn't showing up well on radar. Along with a few viewer reports of freezing drizzle, visibility has also dropped over the last couple of hours. This is a good indication that there is either mist or drizzle occurring in those locations. And with temperatures either at or just below freezing across much of northern Illinois, the drizzle is likely freezing on contact. 

Untreated road surfaces, sidewalks, driveways, bridges, and overpasses are likely to be slick through the evening. After about 9pm/10pm, light freezing rain will begin to work its way north into the region. For the majority of the night the main precipitation type will end up as freezing rain, although some rain showers may try to mix in from the south. 

This will create anywhere from a glaze of ice up to a tenth of an inch of ice accumulation for most, although there could be locally higher amounts to the southeast. The greatest impacts from the freezing rain will occur after 9pm, and last through 9am Tuesday. Around daybreak Tuesday wet snow will also be possible for some, accumulating to a couple inches in a few locations. The highest likelihood of that occurring appears to be for those in southern Wisconsin, far northern and northwest Illinois. This, along with the freezing rain, could make travel rather difficult during the morning commute. 

Most of the wintry precipitation will be ending around Noon, with mostly cloudy skies expected during the afternoon and evening. Dense fog will then be possible late Tuesday night into Wednesday with temperatures in the low 30s.