This article discusses the polar vortex and its impact on weather. You could get frostbite in as little as five minutes. It will be warmer in Antarctica than it is in Des Moines. It could feel like minus 65 in Minneapolis.
The polar vortex is bringing dangerously low temperatures to a wide swath of the Midwest, forcing schools and universities to close and leading the governors of Illinois, Michigan and Wisconsin to declare emergencies.
Here are some of the salient facts about this brutal cold front.