The U.S. is in a race to cram in as much unhinged weather as possible before the year ends. The latest addition to the trophy case: bone-chilling cold in the Northern Rockies and Midwest, where wind chill values could reach minus-50 degrees Fahrenheit (minus-46 degrees Celsius) over the next two...

The U.S. is in a race to cram in as much unhinged weather as possible before the year ends. The latest addition to the trophy case: bone-chilling cold in the Northern Rockies and Midwest, where wind chill values could reach minus-50 degrees Fahrenheit (minus-46 degrees Celsius) over the next two...