An area of low pressure lifted out of the southern plains and into the Ohio Valley on January 20th (See Below for Satellite Imagery) as it interacted with an upper level disturbance that moved in from the northern plains. These came together with an abundance of moisture and the right ingredients to produce healthy and efficient snowfall. Northern Illinois and northwestern Indiana experienced anywhere from 4 to over 9 inches of snowfall by the time the storm exited to the East.
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Below are snapshots of the regional and local snowfall that impacted the entire midwest
Local Radar Imagery (click for a large loop)
Here is a preliminary look at the snowfall totals from January 20th, 2012:
|Local Storm Report Summary||Ranked Snowfall Reports|