Snow and chilly temperatures have already greeted some Thanksgiving travelers and plenty more could be on its way this holiday weekend, with winter storm warnings Saturday across much of the northern part of the country. Storm warnings and advisories extended from Montana to New York, the National Weather Service said. Snow was expected to start Friday and last well into the weekend in some areas with Iowa and Illinois getting the brunt of it. Six inches (about 15 centimeters) to a foot (30 centimeters) or more of snow is expected in much of west-central Illinois Friday night through Saturday night. So far, forecast conditions do not meet blizzard warning criteria, meteorologists said — winds of at least 35 mph (56 kph), visibilities of less than a quarter mile (400 meters) and lasting mor

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