Feedback

Deep freeze

Temperatures plummeted as a whirlpool of frigid, dense air known as a "polar vortex" descended on much of the United States.

Ice forms on the shore of the East River due to unusually low temperatures caused by a Polar Vortex in New York on Jan. 7, 2014. A blast of bone-chilling cold snarled air travel, closed schools and prompted calls for people to stay inside in the United States and Canada, as temperatures plunged to lows not seen in two decades. Superlatives of cold-talk abounded, even in midwestern states used to chest-high snow and bitter cold, as the National Weather Service said the deep freeze was making its way east. Lucas Jackson / Reuters
A woman braves the cold during her morning commute on Jan. 7 in New York. Timothy Clary / AFP - Getty Images
A woman braves the cold during her morning commute on 5th Avenue on Jan. 7 in New York. A blast of bone-chilling cold snarled air travel, closed schools and prompted calls for people to stay inside in the United States and Canada, as temperatures plunged to lows not seen in two decades. Timothy Clary / AFP - Getty Images
A man's breath can be seen as he walks on East 86th Street on the east side of Manhattan on Jan. 7 in New York. Stan Honda / AFP - Getty Images
A woman bundled against the cold walks past a homeless man in McPherson Square as temperatures dipped into the single digits Fahrenheit and minus degrees with the wind chill on Jan. 7 in Washington, D.C. Mladen Antonov / AFP - Getty Images
Chris Griesmeyer dons ski goggles and a mask to protect himself from the harsh wind chill as he walked in the sub-freezing temperatures on Jan. 6 in Arlington Heights, Ill. Mark Welsh / Daily Herald via AP
Mist rises from Lake Michigan at North Avenue Beach as temperatures dipped well below zero on Jan. 6 in Chicago. Chicago hit a record low of --16 degrees Fahrenheit --as a polar air mass brought the coldest temperatures in about two decades into the city. Scott Olson / Getty Images
The Spirit of Detroit statue is shown covered in snow in Detroit on Jan. 6. Paul Sancya / AP
Farmer Randy Cree chops a hole in the ice while a cow waits to drink water from a pond near Big Springs, Kan., on Jan. 6. Orlin Wagner / AP
Eli Esch, 13, right, enjoys a day off from school because of the bitter cold on Monday, Jan. 6 in Minneapolis. Eli and his dad Tom, left, built this snow fort and igloo over the last few weeks. Its relatively warm in the igloo and the two spent the night in it last week. Glen Stubbe / AP
Ice builds up along Lake Michigan at North Avenue Beach as temperatures dipped well below zero on Jan. 6 in Chicago. Scott Olson / Getty Images
In an image made with a fisheye lens, Marguerite Johnston uncovers her car in Grosse Pointe, Mich., on Jan. 6. Paul Sancya / AP
Postal worker Chris Newberg works his route in -25 degrees Celsius weather in Minneapolis on Jan. 6. Craig Lassig / EPA
Steam rises from the tops of buildings in the Chicago skyline on Jan. 6 as a whirlpool of frigid, dense air known as a "polar vortex" descended on the city. Teresa Crawford / AP
Laurel O'Connor works to scrape ice off of her windshield before driving on Jan. 6 in Bowling Green, Ky. Alex Slitz / AP
Snow covers John Brower's eyelashes after running to work in the frigid weather on Jan. 6 in Minneapolis. Elizabeth Flores / AP
A commuter walks past warming lamps to an exit on Chicago's elevated train tracks with temperatures well below zero on Jan. 6 in Chicago. Charles Rex Arbogast / AP
Two people duck into the blowing snow as they leave the U City Loop next to the statue of Chuck Berry on Sunday morning, Jan. 5, in St Louis. Heavy snow combined with strong winds and bitter cold created a dangerous winter mix over much of Missouri. J.B. Forbes / Post-Dispatch via AP
Ron, a bison at the Brookfield Zoo, is covered in snow and doesn't seemed phased by the frigid temperatures or snow blowing through the Chicago area on Jan. 5. The zoo was closed on Jan . 6 due to the snowstorm and sub-zero temperatures. It was only the fourth time in Brookfield Zoo's history, which opened in 1934, that it has closed due to severe weather conditions. Jim Schulz / Chicago Zoological Society via AP