(11:45AM - 3/21/20) Another sign that winter is hanging on from time to time...It continues to look like that a minor snow event will occur across Northern and Central Illinois, Sunday into Monday...as a weak storm system moves through the region. With this update we have increased expected snowfall amounts for some areas.
Synopsis...
A weak storm system is expected to push through the region, Sunday into Monday. There is high model guidance agreement for a minor accumulating snowfall event to impact portions of the state during this period, very good agreement on location of the snowfall axis, now finally good agreement on snowfall amounts. Precipitation is expected to spread into the western half of the state Sunday morning. Across Northern Illinois, all of this event is expected to be snow, with the transition zone of rain to snow expected to set up across Central Illinois. Precipitation will continue into very late Sunday night or early Monday morning, before ending. Given the recent mild/warm temperatures and expected marginal temperatures during this event, snow will likely not efficiently accumulate. Thus, highest accumulation will be on colder surfaces (such as grass), with road accumulation far less. These temperature factors will also play a roll in final snowfall accumulation amounts as well. Final snowfall totals upwards of a dusting to 1-3" will be possible across Northern and Central Illinois.
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