This picture was taken in Westchester, a suburb of Chicago.

CHICAGO — Some crews repaired downed power lines, others swept debris from train tracks and National Guardsmen went door-to-door checking on residents after the Midwest’s first big snowstorm of the season.

As temperatures fell below freezing, officials warned Saturday that some people could be without power for days.

The storm was blamed for at least 13 deaths as it spread ice and deep snow from Texas to Michigan and then blew through the Northeast late Friday and early Saturday. Schools and businesses were shuttered, and hundreds of travelers were stranded by canceled flights.

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