Arctic air sends temperatures well below zero in midwest US

A brutal cold wave moved eastward Thursday after bringing temperatures in the US Midwest lower than those in Antarctica, grounding flights, closing schools and businesses and raising fears of hypothermia. Mail deliveries were suspended and people were encouraged to stay home in nearly a dozen US states where the mercury plunged into the negative double digits, the worst freeze to grip the region in a generation. The phenomenon stemming from a blast of Arctic air caused surreal scenes throughout the region, such as steam rising off the waters of Lake Michigan -- the result of extremely cold air passing over warmer water below.

from https://news.yahoo.com/colder-antarctica-brutal-deep-freeze-grips-us-midwest-180149493.html