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A commuter waits on a train during a winter snowstorm Tuesday, Dec. 10, 2013, in Philadelphia. Accumulations of 3 to 6 inches were expected as the National Weather Service issued a winter storm warning for the Eastern Seaboard, including Baltimore, Washington, D.C., Philadelphia and Wilmington

Matt Rourke/AP

A commuter waits for a train during a snowstorm in Philadelphia, US

A shopper rests in the shoe section of the Macy's Herald Square store, in New York. Instead of waiting for Black Friday, which is typically the year's biggest shopping day, more than a dozen major retailers opened on Thanksgiving this year.

John Minchillo/AP

A shopper rests in the shoe section of Macy’s Herald Square store in New York on Black Friday, the US’s busiest shopping day of the year

The Spiderman balloon floats down Central Park West during the 87th Macy's Thanksgiving Day Parade in New York November 28, 2013.

Gary Hershorn/Reuters

A Spiderman balloon floats down Central Park West in New York during a Thanksgiving parade

An aerial view at night of the downtown Chicago skyline. An Arctic air mass is expected to chill much of the Central Plains and the East Coast through Monday with wind-chill temperatures dropping into the single digits overnight in some places.

Kiichiro Sato/AP

A nightime aerial view of downtown in the US city of Chicago

Vettori, Piano and Kovar of Italy jump to block the ball spiked by Anderson of the U.S. during their FIVB Men's Volleyball Grand Champions Cup 2013 in Tokyo...(L to R) Luca Vettori, Matteo Piano and Jiri Kovar of Italy jump to block the ball spiked by Matthew Anderson of the U.S. during their FIVB Men's Volleyball Grand Champions Cup 2013 in Tokyo November 22, 2013.

Yuya Shino/Reuters

(From left) Luca Vettori, Matteo Piano and Jiri Kovar, of the Italy men’s volleyball team, jump to block a ball during their match against the US at the FIVB Grand Champions Cup tournament in Tokyo

President Barack Obama awards former President Bill Clinton with the Presidential Medal of Freedom, Wednesday, Nov. 20, 2013, during a cermeony in the East Room of the White House in Washington.

Jacquelyn Martin/AP

President Barack Obama awards former president Bill Clinton with the presidential medal of freedom on Wednesday, during a ceremony at the White House, Washington.

.James Getty, portraying President Abraham Lincoln, stands before a ceremony commemorating the 150th anniversary of the dedication of the Soldiers  National Cemetery and President Abraham Lincoln's Gettysburg Address, Tuesday Nov. 19, 2013, in Gettysburg, Pa. Lincoln's speech was first delivered in Gettysburg nearly five months after the major battle that left tens of thousands of men wounded, dead or missing. Getty is scheduled to deliver the Gettysburg Address at Tuesday's ceremony.

Matt Rourke/AP

James Getty, portraying President Abraham Lincoln, stands before a ceremony commemorating the 150th anniversary of the dedication of the Soldiers National Cemetery and President Abraham Lincoln’s Gettysburg Address on Tuesday, in Gettysburg, Pa. Lincoln’s speech was first delivered in Gettysburg nearly five months after the major battle that left tens of thousands of men wounded, dead or missing. Getty is scheduled to deliver the Gettysburg Address at Tuesday’s ceremony.

Boston Red Sox relief pitcher Koji Uehara and catcher David Ross celebrate as Red Sox beat St. Louis Cardinals' to end a 95 year wait to clinch the World Series title at Fenway Park Stadium, Boston. The last time Red Sox won the World Series, all-time great Babe Ruth was one of their lead pitchers.

Matt Slocum / AP

Boston Red Sox relief pitcher Koji Uehara and catcher David Ross celebrate as Red Sox beat St. Louis Cardinals to end a 95 year wait to clinch the World Series title at Fenway Park Stadium, Boston.

With the BART transit system on strike, traffic slows on the Richmond-San Rafael Bridge during the morning commute Monday, Oct. 21, 2013, in San Rafael, Calif.  San Francisco Bay Area commuters started the new work week on Monday with gridlocked roadways and long lines for buses and ferries as a major transit strike entered its fourth day. At the same time, federal investigators were searching for clues to a weekend train crash that killed two workers.

Eric Risberg/AP

As the BART transit system entered its fourth day of strikes, traffic slows on the Richmond-San Rafael Bridge, as San Francisco Bay Area commuters started the new working week on Monday with gridlocked roads and long lines for buses and ferries. At the same time, federal investigators were searching for clues to a weekend train crash that killed two workers.

US Vice President Joe Biden greets Environmental Protection Agency workers with muffins as they return to work after 16 days of a government shutdown at the William Jefferson Clinton Federal Building in Washington DC.

Jacquelyn Martin / AP

Joe Biden, US vice-president, greets Environmental Protection Agency workers with muffins as they return to work after 16 days of a US government shutdown at the William Jefferson Clinton Federal Building in Washington.