Jenny Hackett walks across a street in St. Louis as snow swirls around her. ( Jeff Roberson / Associated Press / January 6, 2014 )

Deep freeze (Polar Vortex) in the U.S. MidwestDeep freeze (Polar Vortex) in the U.S. Midwest

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In south Minneapolis, a man walks across frozen Lake Harriet and a backyard In south Minneapolis, a man walks across frozen Lake Harriet and a backyard thermometer shows the temperature as a blast of Arctic air gripped the mid-section thermometer shows the temperature as a blast of Arctic air gripped the mid-section of the United States. (Eric Miller/Reuters)of the United States. (Eric Miller/Reuters) 2

A car is covered in snow in Zionsville, Ind. ( Darron Cummings / Associated Press / January 6, 2014 ) 3

Few cars drive on Interstate 44 in Fenton, Mo. Snow-covered roads and high winds were creating dangerous driving conditions from Missouri to Delaware ahead of a "polar vortex" that will bring below-zero temperatures not seen in years to much of the nation in the coming days, likely setting records. ( J.B. Forbes / Associated Press / January 6, 2014 ) 4

Daryl Daugherty clears the sidewalk in front of his home in Carmel, Ind., as temperatures dropped at least 10 below zero. ( Michael Conroy / Associated Press / January 6, 2014 ) 5

6New York City bus on tyre chains as it is driven down 5th Avenue in the snow(Source: Reuters)

7A snow-covered bus shelter in downtown Chicago(Source: Reuters)

8Dog-walker in Cedar Hill in New York's Central Park(Source: Reuters)

Lynette Johnson blows the snow from her driveway in Springville, N.Y. ( Harry Scull Jr. / Associated Press / January 7, 2014 ) 9

Delicate patterns of frost form on a bus stop in Detroit, where frigid temperatures broke records and residents braced against bitter winds as schools and government offices were closed. ( Paul Sancya / Associated Press / January 7, 2014 ) 10

Leroy Griffis, a maintenance supervisor for the Flint Downtown Development Authority, directs a snowplow to an assignment in downtown Flint, Mich., where 16.2 inches of snow fell. ( Jake May / Associated Press / January 6, 2014 )

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Two people duck into the blowing snow as they leave the U City Loop next to the statue of Chuck Berry in St. Louis. ( J.B. Forbes / Associated Press / January 6, 2014 ) 12

With temperatures at about 22 degrees below zero, it was hard to find the beauty in the brutal weather in Bismarck, N.D. On Highway 83, north of the state capital, passersby could see a sundog, or a ring of light visible around the sun or moon when light is refracted through ice crystals in the atmosphere. ( Brian Peterson / Associated Press / January 6, 2014 )

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The reflecting pool on the National Mall in front of the U.S. Capitol in Washington is frozen over. 14

Ice covers rocks and encases brush at Edgewater Park in Cleveland. ( Mark Duncan / Associated Press / January 7, 2014 ) 15

A passenger jet is sprayed with deicing agent at Indianapolis International Airport. ( Joe Vitti / Associated Press / January 7, 2014 ) 16

A woman pushes her daughter and their groceries through blowing snow at a shopping center in Saginaw Township, Mich. ( Jeff Schrier / Associated Press / January 7, 2014 ) 17

A woman walks to her car in the long term parking lot at Indianapolis International Airport. The coldest, most dangerous blast of polar air in decades gripped the Midwest and pushed toward the East and South, closing schools and day care centers, grounding flights and forcing people to pull their hoods and scarves tight to protect exposed skin from nearly instant frostbite. ( Joe Vitti / Associated Press / January 7, 2014 ) 18

19Travellers leave the Back Bay train and subway station in Boston, Massachusetts(Source: Reuters)

A firefighter is covered in frost as he directs a hose on a fire that engulfed Happy's Pizza in Ann Arbor, Mich. ( Courtney Sacco / Associated Press / January 7, 2014 ) 20

Icicles form on street signals as firefighters pour water on a fire that engulfed Happy's Pizza in Ann Arbor, Mich., amid subfreezing weather.

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Commuters make their way across the Chicago River. (Scott Olson/Getty Images)

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Commuters arrive at the La Salle Street commuter rail station as they experience temperatures well below zero and wind chills expected to reach 40 to 50 below in Chicago. (Charles Rex Arbogast/Associated Press) 23

Tony Berard makes his way down Highland Road in Waterford, past a car that had slid off the road, on his way back from work in White Lake, Michigan. (Daniel Mears/Detroit News)

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25Pedestrians skirt mounds of snow during bitter cold temperatures in downtown Detroit(Source: Reuters)

A woman walks briskly as she arrives at the La Salle Street commuter rail station in Chicago. Temperatures were expected to reach well below zero.

Deep freeze in the Midwest

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A woman slips on ice during freezing rain in New York City on Sunday. (Zoran Milich/Reuters)27

Two people duck into the blowing snow as they leave the U City Loop next to the statue of Chuck Berry, Sunday morning in St. Louis. (J.B. Forbes/St. Louis Post-Dispatch) 28

Allan Umscheid, owner of Yards By Al in Lawrence, Kan., feels the bitter wind and catches drifting snow on his face as he runs a snow blower. ( Mike Yoder / Associated Press / January 6, 2014 )

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Bill Brasche is bundled up against the snow and wind as he clears his driveway in Springfield, Ill. ( Justin L. Fowler / Associated Press / January 7, 2014 ) 30

Only his eyes are visible as a frost-crusted Hank Wade clears snow from a sidewalk Only his eyes are visible as a frost-crusted Hank Wade clears snow from a sidewalk in Lyndhurst, Ohio. ( Tony Dejak / Associated Press / January 7, 2014 )in Lyndhurst, Ohio. ( Tony Dejak / Associated Press / January 7, 2014 )

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Commuters make a sub-zero trek, causing glasses to fog up, to offices in the Loop in Chicago. Temperatures in the city dipped to -16 degree Fahrenheit Monday morning on the heals of a polar vortex that has swept into the Midwest bringing with it dangerously cold temperatures not seen in the area in about 20 years. (Scott Olson/Getty Images)

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John Brower's eyelashes and eyebrows are covered with snow after running to work in the frigid -20 weather in Minneapolis, and the cold weather makes vision challenging as Jobin Curow's glasses fog up while walking in subzero temperatures and wind chills reaching -40 to -50 degrees on the Lawrence University campus Monday in Appleton, Wisconsin on Monday. (Elizabeth Flores/The Star Tribune, Sharon Cekada/The Post-Crescent)

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John Brower's eyelashes and eyebrows are covered with snow after running to work in the frigid -20 weather in Minneapolis, and the cold weather makes vision challenging as Jobin Curow's glasses fog up while walking in subzero temperatures and wind chills reaching -40 to -50 degrees on the Lawrence University campus Monday in Appleton, Wisconsin on Monday. (Elizabeth Flores/The Star Tribune, Sharon Cekada/The Post-Crescent)

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A woman walks in frigid cold temperatures though downtown Chicago on Monday. (Jim Young/Reuters) 35

The Chicago skyline is seen as the arctic sea smoke rises off Lake Michigan, Monday evening. (Jim Young/Reuters)36

With temperatures nearing zero, a cloud of steam from a manhole blows across an intersection in downtown Pittsburgh during Monday's evening rush hour. The National Weather service is calling for a temperature of -11 degrees overnight, with a high of 2 degrees on Tuesday. (Gene J. Puskar/Associated Press) 37

JANUARY 7: Ice forms on rocks on the Brooklyn waterfront across from lower Manhattan. The high temperature is expected to be 10 degrees in the city but wind-chills will make it feel more like minus 10. (Peter Morgan/Associated Press) 38

JANUARY 7: Ann Arbor firefighters carry hoses in as they work to put out the fire that engulfed Happy's Pizza. (Melanie Maxwell/The Ann Arbor News) 39

The high temperature in New York City is expected to be 10 degrees in the city but wind chills will make it feel more like minus (Photography by Gordon Donovan)

The high temperature in New York City is expected to be 10 degrees in the city but wind chills will make it feel more like minus (Photography by Gordon Donovan)

The high temperature in New York City is expected to be 10 degrees in the city but wind chills will make it feel more like minus (Photography by Gordon Donovan)

43A traveller reacts to news of delays at the check-in counter of JetBlue Airways terminal at John F Kennedy International Airport in New York(Source: Reuters)

Marguerite Johnston uncovers her car in Grosse Pointe on Monday. Michigan residents are preparing for diving temperatures as they dig out from as much as 15 inches of snow. (Paul Sancya/Associated Press)

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Mist rises from Lake Michigan as temperatures dip well below zero in Chicago. (Scott Olson/Getty Images)45

Ray Pass gets a chance to use his cross country skis on a street in University City, Missouri, near his home on Sunday morning. (J.B. Forbes/St. Louis Post-Dispatch)

461/08/2014 1/08/2014 王文堯王文堯 Kaohsiung Taiwan R.O.CKaohsiung Taiwan R.O.CAll photos were taken from internet.All photos were taken from internet. THE ENDTHE END