NOAA satellite image showing snow from Winter Storm Hercules blanketing most of nation.
Record low temperatures expected across northern section of the United States into early next week.
The coldest air since 1996 will arrive early next week. For many younger people, this will be the coldest air they have ever experienced in their lives.
Frostbite can occur in as little as half an hour with temperatures near zero degrees Fahrenheit and winds of 20 miles per hour.
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