(12:15PM - 4/13/19) A late season snow event is still on track to affect portions of the state from late tonight into Sunday evening, as a strong spring storm system pushes through the region.
Model guidance from overnight and this morning has shifted back northward and snowier with this event. This is after model guidance from yesterday afternoon and evening shifted south and less snowy. With that said, will stick fairly close to original forecast from earlier yesterday, with small adjustments based on guidance and growing confidence in the evolving situation.
An area of rain is expected to spread northward across Central and portions of Northern Illinois tonight. As dynamic cooling occurs and temperatures in the lower levels cool, the north end of this rain shield will mix with and turn to snow across portions of Northern and Central Illinois early Sunday morning. Snow will then be likely in varying intensity from Sunday morning into Sunday evening for the aforementioned areas.
An axis of 1-3” of snow is likely from Central Illinois up into Northern Illinois, with a corridor of 3-6" possible within the main snow axis as well. This will be a heavy and wet snow, with greatest accumulations occurring on colder surfaces...such as grass. Additionally, lower snow accumulations are likely in the vicinity of downtown Chicago, due to the urban heat island effect.
Below is our updated TAM snowfall forecast for this event.
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