(10:15PM - 2/11/19) A short term update on what is now a significant winter storm affecting the state tonight, and will continue into Tuesday night...
A large area of freezing rain is currently falling at this time across much of Northern Illinois. This freezing rain is a product of a wedge of "warm" air aloft, with colder temps surface. This is allowing the snow aloft to melt and fall to the surface as rain, then freeze due to the at or below freezing air temps here at the surface. This storm is quickly changing from multiple threats, into one main threat...an ice storm. Widespread freezing rain will continue overnight and into tomorrow morning across much of Northern Illinois. Widespread ice totals will be 0.25-0.75" across Northern and even into portions of Western Illinois. Power outages and tree damage is possible, and may become even more of an issue on Tuesday as winds increase to 30mph+.
Snow/sleet will continue to be more likely across the far north, near the Illinois/Wisconsin border...but may mix with freezing rain there for a time as well.
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