(12:00AM - 2/4/19) It is looking more and more likely as time goes on that the stage is being set for an ice event across all of Northern and portions of Central Illinois Tuesday afternoon into Wednesday morning.
A disturbance ejecting out across the region will aid in the development of precipitation to our west, across Iowa and Missouri Tuesday. This activity will spread into portions of Northwest and Western Illinois by mid-afternoon Tuesday. With below freezing temperatures at the surface and a wedge of "mild" air aloft, precip is expected to fall in the form of freezing rain. This will spread across all of Northern and portions of Central Illinois into the evening and overnight, before ending from west to east Wednesday morning.
It is possible some precip will be more of a mix (snow/sleet/ice) across far Northern Illinois, near the Wisconsin border, where the wedge of "mild" air aloft will be much more narrow. Additionally, some elevated instability will be present, which will lead to the chance of some isolated thunderstorms...yes, freezing rain producing thunderstorms.
As of now it looks like the axis for highest ice accumulation will run SW-NE, from Western Illinois on up into the Chicago area. Within this axis, upwards of around 0.25" ice accumulation may occur.
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