Blizzard warnings were in effect in parts of the upper Midwest on Wednesday as a winter storm continued to churn eastward across the region, dumping heavy snowfall that was already beginning to disrupt Thanksgiving plans for some travelers.

Chicago O’Hare International Airport reported ground delays because of snow and ice, according to the Federal Aviation Administration. The Wisconsin Department of Transportation cautioned drivers that “partially covered and completely covered roads” were being reported, particularly in the northern and far northwestern parts of the state.

At least one death was reported in connection with the storm. A 69-year-old man was killed when a tree fell on him as he was operating a snowblower on his property in Alden Township in northeastern Minnesota. The St.

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