(11:00PM - 1/22/19) Tuesday night update on the winter storm that continues to affect the state tonight...
A large area of snow in varying intensity is currently ongoing across the Quad Cities area and across much of Northern Illinois north of I-88. As mentioned in the earlier short term update, the rain/snow line was expected slowly push north and stall just north of I-88, and since that time it has done just that. The rain/snow line should stay fairly stationary the next couple to several hours, thus keeping snow mainly confined to around the Quad Cities and north of I-88 in Northern Illinois. Later tonight and tomorrow morning the rain/snow line will slowly shift back southeast, bringing the chance for snow to more of Northern Illinois and even portions of West-Central Illinois. Periods of moderate to heavy snow and snowfall rates of 0.5-2" per hour are likely at times tonight and tomorrow morning across portions of Northern Illinois, with a couple to several inches of accumulations likely depending on your location. The axis of heaviest snowfall amounts of 6-9" will be across Northwest Illinois, with locally higher amounts possible. It should also be noted that the freezing rain threat has come to an end for most areas.
Further south, rain will continue to be likely for portions of Central and Southern Illinois tonight into tomorrow morning.
Below is our updated TAM snowfall forecast. Also below is our previous TAM ice accumulation forecast, however as stated above, the ice threat has come to an end and no additional ice accumulation is expected.
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