Much of the Northeast United States is suffering from subzero conditions Friday, affecting more than 30 million people.
Here's The Weather Channel's map:
The chill is expected to last through the weekend for most areas, bringing public officials to issue safety warnings:
New York City is expecting record lows, Mayor Bill de Blasio said Thursday: "It's serious stuff. Starting tonight and going through Sunday, we're going to be experiencing extraordinarily cold weather, and people should take appropriate precautions. Temperatures are expected to plummet to near-record lows, and remain dangerously cold through the weekend. On Sunday, it could be the coldest in at least 20 years, so this is something to take very, very seriously."
People are bracing for the chill:
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