A winter storm warning was issued overnight for nearly the entire Chicago area including southeastern Wisconsin, with heavy snow expected " all day long Saturday, " with as much as 12 inches of snow or more for some parts and major travel impacts possible, with experts warning of snow-covered roads and reduced visibility.

The warning comes as more than 41 people from the northern and central plains to the Midwest were under winter storm alerts, with the National Weather Service advising people in northeast Illinois to "consider altering any travel plans originally scheduled for Saturday."

The winter storm warning goes into effect at 3 a.m. and lasts through 6 a.m. Sunday. The NWS originally issued a winter storm watch for the area, but it was upgraded overnight.

When will the snow

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