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The lake-effect snow around the Great Lakes will arrive primarily tonight and Saturday morning. However, "while the event will be relatively brief, lasting 12 hours or so, it will be the first widespread lake-effect snow event of the season," reports AccuWeather winter weather expert Brian Wimer.

Lake-effect snow is common this time of year downwind of the Great Lakes, as the combination of cold air flowing over the relatively warm lakes provides the fuel for snowstorms to develop.

The greatest risk of blinding snow showers would be Friday night into Saturday morning in Michigan and mostly during the day Saturday over the eastern Great Lakes and central Appalachians, AccuWeather predicts.

"Enough snow can fall in some areas to make roads slippery and bring sudden low visibility for highway travelers," reports Alex Sosnowski.

Ongoing rain and snow will continue to make for a dank, dismal holiday weekend in the Pacific Northwest.

After a mild Thanksgiving Day for most of the country, temperatures will start to take a plunge throughout the central U.S. today. The high in Chicago should only be in the mid-30s Friday.

By the weekend, holiday shoppers across most of the central and eastern parts of the country will see very cold, windy weather both Saturday and Sunday, so bundling up will be necessary while walking in and out of the mall.

The National Weather Service is forecasting high temperatures Saturday and Sunday in the 30s, 40s and 50s for most of the eastern half of the nation, with only Florida reaching the 70s.

Most of the western half of the country will be milder than average this weekend. But by Sunday, another blast of frigid air will start to spill down into the northern Rockies and northern Plains, with highs only in the teens and 20s.

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