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8pm Update: Light snow continues to fall Wednesday evening, with a little more steady snow from Janesville, Monroe and Freeport. Accumulations have already started, but are mostly on grassy surfaces. Snow totals will still range from 1" to 2" through the overnight.
The transition over to light snow has started now that the upper level low is moving over northern Illinois. There may still be some sleet/drizzle mixing in with the snow, but I do expect a transition to all snow by 7pm this evening.
Snow accumulations will remain light and mostly confined to grassy surfaces. But slush filled roads can be expected through early Thursday morning. Most of the snow will be done between Midnight and 3am Thursday morning, but cloud cover will stick around through Thursday morning. Even though the precipitation will be done before sunrise Thursday, untreated roads will still be slick. Be careful on bridges and overpasses, around curves and on/off ramps.
Visibility has also been a concern this evening and has actually lowered with more moisture wrapping in around the upper level low. Falling snow will help to lower the visibility even further this evening and overnight. It's already down to under a mile in Galena/Dubuque. Fog may linger for some early Thursday with temperatures climbing back into the mid 40's.
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