(2:15AM - 1/22/19) Our Midwest winter storm that is going to bring a variety of wintry precipitation to the region, including portions of Illinois, is slowly getting its act together early this morning well to our west. The main upper level low (circled) is beginning to move out of the Four Corners region and will eject out into the central and southern plains later this morning, essentially kicking off the development of what will be a significant Midwest winter storm.
At the surface, our area of low pressure is beginning to develop on the lee side of the Rockies early this morning and this will also push out into the plains later today, initially moving east at first before turning more northeast.
As the surface low moves in our direction, that strong warm, moist air will be advected northward and help aid in widespread precipitation developing across portions of the central plains and into the western Midwest, just off to our west by the afternoon today.
Model guidance continues to slowly trend colder and further south, which would put a larger area of Illinois under the risk of freezing rain, or at least a brief period of it, and also a higher risk for significant accumulating snow across far northern Illinois. Some places across northern Illinois look to have the potential to see several inches of snow out of this during the evening and into Wednesday morning.
Below is our first thought on both freezing rain/ice accumulations as well as snow accumulations from this system as portions of far northern/northwest Illinois could remain all snow into the overnight and morning hours on Wednesday. Updates will continue on this storm later today.
MP
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