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CHICAGO (WLS) –
The rain will become snow Sunday in the Chicago area with several inches of expected accumulation.
A winter storm is heading to the Chicago area late Sunday afternoon. A winter storm warning for the counties of Cook, DuPage and Lake was extended until 9 o'clock on Monday morning.
A winter storm warning is also in effect in Boone, DeKalb, Kane, Lee, McHenry, Ogle and Winnebago counties in Illinois until Monday at 6 am
The moment of the storm could cause a nightmare for travelers trying to return home later today.
Sunday at 8 am, 154 flights had been canceled at the airport O & # 39; Hare and six flights to Midway.
CLICK HERE for the latest 7-day weather forecast from the First Alert weather team:
Airlines advise travelers to check their flights before traveling to the airport. Many airlines also waive flight modification fees.
Both Chicago airports will be flooded with vacationers trying to get home.
In Chicago alone, about 260,000 passengers will make their way through O & # 39; Hare and 90,000 by Midway.
AAA predicts that more than 54 million Americans have traveled this year for Thanksgiving, an increase over last year.
In Illinois, 2.5 million people drive and hundreds of thousands of others fly.
The main concern of the passengers is the impending storm.
It will begin as rain and then change to snow, with some areas showing 8 inches of snow or more. It will not be over before dark, which could lead to a lot of delays and cancellations.
If you drive, leave a little earlier and try to get ahead of the storm.
The strongest snow is expected from DeKalb County to the north and east of Lake County with snowfall of up to 10 to 12 inches. There should be between 4 and 6 inches of snow in downtown here by Sunday night.
A lake-side flood warning was also issued for Cook, Lake and Porter counties starting at 9 pm. Sunday at noon Monday due to high water levels and high winds.
PROSPECTS SUNDAY TIME: Untidy weather forecast Sunday in the Chicago area and much of the Midwest. A strong low pressure system will leave Missouri on Sunday morning. The trajectory of the low pressure system is still uncertain, but there will likely be a thick snow band from this system.
TIMING: The rain will spread in northern Illinois and northwest Indiana on Sunday morning. The rain will turn to snow from west to east during the afternoon or evening Sunday. The beginning of this change will determine the amount of snow we see. Could be very little or heavy snow.
SUNDAY AFTERNOON: The rain will turn into snow from west towards the city in the afternoon. When this change occurs, it is uncertain and may not occur until Sunday evening or even night in some areas. Time in the 30s. Combined with winds of 30 to 40 km / h, dangerous travel conditions are to be expected.
Doppler 7 MAX 
CLICK HERE to see the latest radar view of LIVE Doppler 7 MAX
SUNDAY NIGHT: Rain will turn to snow in all areas where it has not yet done so. Snow accumulation is likely in most areas during this time. How many? Depends on the passage time. Time falling in the 20s.
MONDAY MORNING: Time in the 20s. Messy morning moves with ever-falling snow and slippery spots on the roads due to the snow during the night.
HOW MUCH SNOW ?: On the map below, the shaded area in dark blue can show totals greater than 4 "+ .If the heavy snow band moves south, parts of northern Illinois could see as much.
Snow totals can range from 1 to 8 inches in the region, depending on the storm's trajectory.
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