Timeline: What to Expect in the Biggest Snowstorm of the Season So Far

The biggest snowstorm of the winter season is expected to dump nearly a foot of snow, possibly more, on parts of the Chicago area. Here's a look at what you need to know and when.

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AP
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A Winter Storm Warning takes effect across the Chicago area and northwest Indiana at 6 p.m. Thursday and continues until Friday evening. In McHenry, DeKalb, Kane, LaSalle and Kendall Counties the warning expires at 6 p.m.
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AP
In Lake, DuPage, Cook and Will Counties, it expires at 9 p.m. In Lake and Porter Counties in Indiana, the warning ends at 9 p.m. as well.
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Temps will dip to the low-20s late-Thursday and into Friday as heavy snow begins to fall. Overnight totals will reach between 3 and 8 inches.
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By Friday afternoon, highs will be near 30 degrees as snow totals rise to anywhere from 6 inches to a foot of snow in some locations.
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Snow will begin covering the area during the evening rush hour Thursday.
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Staff Photographer
Later Thursday evening, snow will cover nearly all of northern Illinois and northwest Indiana, intensifying as the evening goes on.
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Departamento de Policía de Grand Prairie
Heavy snow will continue falling Thursday evening and into the overnight hours.
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NYPD
The snow will continue throughout the overnight hours.
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Heavier snow (identified as darker blue colors) will cover much of the Chicago area overnight.
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The band of heavy snow will likely narrow, dropping heavier snow wherever it lands in the Chicago area. Some models predict this band will fall in northern suburbs, while others predict heavier totals south.
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Adriana Mocciola
The morning rush hour will see increasingly difficult travel conditions. Many schools have closed and officials are urging anyone who drives on the roads to use caution.
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Adriana Mocciola
Snow will begin moving out of some locations by Friday morning, but could return soon after.
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by 10 a.m., heavier snow will continue moving east across the area.
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AL ROJO VIVO
The snow will continue to fall through the afternoon hours and into the afternoon rush hour.
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Allie Spillyards, NBC5
For the start of the afternoon rush hour, snowfall will still cover much of the metro area.
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Twitter: @maripilyrivera
And it could cover an even larger portion of the area by the early evening rush.
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Twitter: @maripilyrivera
By 9 p.m. Friday, the band will have shifted south and more toward northwest Indiana, though snow could still fall in some northwest, west and southern suburbs.
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One model predicts that by Thursday evening, more than an inch of snow will have fallen in the area.
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Less than 12 hours later, those totals will have climbed to anywhere from 4-9 inches, according to the Global Model.
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Adriana Mocciola
By 9 a.m., totals could range from 6-10 inches of snow in some locations, Global Model predictions indicate.
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Twitter: @maripilyrivera
By rush hour Friday, anywhere from 8-12 inches of snow is possible.
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And those totals will likely hold for the evening hours Friday.
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The North American Model, however, predicts much lower totals in areas south of Chicago, with larger totals north of the city.
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Telemundo
Snow could still be falling Saturday morning across much of the area.
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It will likely begin moving out by Saturday afternoon, though northwest Indiana and some suburbs could still see some light snowfall.
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Saturday evening, another round of snow moves in.
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That snow will continue to fall overnight and into Sunday morning.
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The snow will intensify overnight and early Sunday morning.
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Sunday morning will continue to see snowfall heading into the afternoon hours.
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Snow will begin moving out by Sunday afternoon, leaving anywhere from 1 to 3 additional inches of accumulation behind.
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By 3 p.m., much of the area will be dry.
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After a weekend of snow, next week looks to start off dry.
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