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.
Snow will start to develop around noon in the northern counties, where the heaviest snowfall is expected to hit.
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.
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.
The heaviest snow is expected to fall between around 8 p.m. and midnight.
Some locations, particularly in the north and west areas, could see accumulations of as much as a foot of snow.
At O'Hare International Airport, anywhere from 7 to 9 inches of snow is possible.
Lesser accumulations are expected at Midway Airport, with anywhere from 4 to perhaps 8 inches of snow falling.
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.
Temperature highs on Monday will top the upper 20s with wind chill values in the teens.
Tuesday's highs likely will only make it into the mid-20s.
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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