(7:00AM - 1/23/20) What seems to be a never ending pattern we are stuck in recently, yet another late week/weekend winter storm will affect the state, through Saturday. This storm system will be of long duration, with light to moderate accumulations of wintry precipitation are likely across a large portion of the state.
A complex setup is unfolding across the region, from now on into the weekend. Several upper air disturbances moving through the region will interact with each other during this time. The result will be the development of a storm system, which will loop through the region. During this period, an extended period of precipitation is likely across the state, through Saturday. Wintry precipitation will be favored for much of Northern and Central Illinois for most of this period, with rain and a mix more likely across Eastern and Southern Illinois. Model guidance continues to be in fairly good agreement regarding this period, with early observations supporting. No real change is needed this update.
A large area of snow is ongoing over much of Northern and Central Illinois this morning, with mixed precipitation and rain across Southern Illinois. Upwards of a dusting to 2" of snow has occurred across Northern and Central Illinois thus far. Precipitation is expected to continue across much of the state from this point right on into Saturday, before slowly ending. Much of Northern and Central Illinois has a good shot at seeing most of the precipitation during this period fall as snow, with only short periods of mixed precipitation or rain expected. Across Eastern and Southern Illinois, much of the precipitation will fall as a mix of precipitation and rain.
Below are maps featuring estimated times precipitation will be ending on Saturday. These visual representations will be much better than several sentences of text, which gets confusing.
Final snowfall totals are expected in the 3-6" range across most of Northern and Central Illinois, with amounts tapering south and east from there. Minor sleet/ice accumulations will be possible as well, across Central and Southern Illinois.
Below is our TAM snowfall forecast for this event.
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