Timeline: What to Expect and When in Sunday Snowstorm

Ahead of potentially heavy snow on Sunday, a Winter Storm Warning has been issued for several counties across Illinois until 9 a.m. Monday, impacting travel plans for those returning from their Thanksgiving holiday.

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The first major snowstorm of the season is expected to arrive Sunday as a Winter Storm Warning has been issued throughout Illinois until 9 a.m. Monday.
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Snow will start to develop around noon in the northern counties, where the heaviest snowfall is expected to hit.
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The rain-snow line can be seen just off to the north and west as it creeps into the southeast during the afternoon and evening hours.
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By 8 p.m. Sunday, most of the Chicago area will see snowfall while rain showers remain in northwest Indiana and also into Kankakee County, where lesser accumulations are expected.
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The heaviest snow is expected to fall between around 8 p.m. and midnight.
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Some locations, particularly in the north and west areas, could see accumulations of as much as a foot of snow.
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At O'Hare International Airport, anywhere from 7 to 9 inches of snow is possible.
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Lesser accumulations are expected at Midway Airport, with anywhere from 4 to perhaps 8 inches of snow falling.
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A few snow showers will still seen by 7 a.m. Monday, wrapping its way out and clearing the way for some clouds for most of the chilly day.
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Temperature highs on Monday will top the upper 20s with wind chill values in the teens.
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Tuesday's highs likely will only make it into the mid-20s.
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A look at the week ahead: Temperatures climb above the freezing mark on Thursday, with a chance for light snow. Another round of rain and snow heading into next weekend is possible.
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