(8:30PM - 2/6/19) Evening update regarding the ice event for portions of the state from now through early Thursday afternoon...
A period of mixed freezing rain and sleet pushed across portions of Northwest Illinois this afternoon and evening. Minor ice and sleet accumulations occurred with this activity.
The main focus will be tonight into early Thursday afternoon, as the main storm system pushes through the region. Large and widespread areas of precipitation will push northeast into the state tonight. This activity will quickly push into portions of Western and Northern Illinois later tonight and early Thursday morning, where surface temperatures and wet bulb temps will be at or below freezing for some areas. This will allow precip to fall as freezing rain initially for areas near the Illinois/Missouri and Illinois/Iowa borders, as well as portions of Northern Illinois. As time goes on into early Thursday morning, temps and wet bulb temps will slowly "warm" a bit which will turn precip to plain rain for many areas, except for far Northwest Illinois, which may stay freezing rain for most of the event. Some sleet is possible for far Northwest Illinois as well. Isolated thunderstorms will also be possible for some areas. As the system passes and colder air wraps in, precip may turn back to a bit of freezing rain or snow for portions of Western and Northern Illinois early Thursday afternoon...before ending.
Below is our updated TAM ice accumulation forecast. Ice amounts for most areas will be minimal. The highest threat is across far Northwest Illinois, where 0.10-0.25" ice accrual will be possible, with minor sleet accumulation also possible.
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