A polar vortex has descended upon the northern and central U.S., bringing sub-zero temperatures, "life-threatening wind chill," and the coldest weather felt in decades. Twenty-six cities are under wind-chill warnings or watches. Chicago and Minneapolis will record temperatures of 20 to 30 below. In North Dakota, wind chills were as low as negative 50 degrees.
School is closed in the entire state of Minnesota, as well as in districts in Illinois, Indiana, Iowa and Wisconsin. Even though today is a snow day, some ski areas, sledding hills, and ice rinks in Minnesota and Ohio are also closed until Tuesday.
Green Bay Packers fans at Sunday's Packers-49ers game in Green Bay, Wisconsin, were grilling frozen beers, to thaw them back to a liquid state.
In Indianapolis, driving is illegal unless there is an emergency or you are seeking shelter.
In Chicago, windows are completely frozen, and some car windows have ice on the inside.
Hundreds of apartment dwellers in Rogers, Minnesota, were evacuated Sunday morning when a propane heating system exploded from the cold.
Rock salt is is ineffective for thawing ice on roads. Several roadways in Illinois are now closed due to drifting snow.
It is very cold in Indianapolis! We have almost 12 inches of snow, and the temperature is -8, with wind chills of 30 to 40 below zero!— Frederick Boggs (@FredBoggs) January 6, 2014
Are you affected by the polar vortex? Post how cold it is for you in the comments.