A monsoon lightning storm strikes over Las Vegas, Nevada in this file photo taken July 7, 2014 (Photo: Reuters)

Tim Bush cleans off cars at Betten Honda in Muskegon, Mich, after the first significant snowfall of the season Thursday, Nov. 13, 2014 (Photo: AP)

A bicycle messenger chains his bike to a snow-covered parking meter in downtown Cleveland Friday, Nov. 14, 2014 (Photo: AP)

A Palestinian protester uses a sling to throw back a tear gas canister fired by Israeli soldiers during clashes following a protest against the near-by Jewish settlement of Qadomem, in the West Bank village of Kofr Qadom near Nablus November14, 2014 (Photo: Reuters)

Indian girls hold hands and wade through a waterlogged street caused by unseasonal rainfall in Ahmadabad, India, Saturday, Nov. 15, 2014 (Photo: AP)

Actors dressed as Saint Nicolas, left, and Black Pete greet children in Antwerp, Belgium on Saturday, Nov. 15, 2014 (Photo: AP)

Blowing sleet and snow make travel hazardous on Interstate 84 near Bridal Veil, Ore., Thursday, Nov. 13, 2014 (Photo: AP)

Russia's Kristina Astakhova and Alexei Rogonov perform during the pairs free skating program at the Rostelecom Cup ISU Grand Prix of Figure Skating in Moscow November 15, 2014 (Photo: Reuters)

Clouds partly cover the sky above Wetterstein mountains near Garmisch-Partenkirchen, in the German Alps, Saturday Nov. 15, 2014 at sunrise (Photo: AP)

Protesters gesture during a demonstration against Islamists by neo-Nazis and self-styled soccer hooligans in Hanover November 15, 2014 (Photo: Reuters)

U.S. President Barack Obama laughs as Australia's Prime Minister Tony Abbott (L) touches a koala he is holding before the G20 Leaders' Summit in Brisbane in this November 15, 2014 handout photo by G20 Australia (Photo: Reuters)

Protesters wear masks made out of photographs of the missing 43 trainee teachers during a march in Xalapa November 14, 2014 (Photo: Reuters)

An undated handout image provided by the Turkish-Italian Archaeological Expedition shows a mosaic floor amid the ruins of the expedition house of Lawrence of Arabia, who worked at Karkemish between 1911 and 1914, at a site outside Karkemish, Turkey, meters away from the Turkey-Syria border and the Syrian city of Jarablous. Archaeology and war don't usually mix, yet that's been the case for years at Karkemish, an ancient city along the Turkey-Syria border where an excavation team announced its newest finds Saturday just meters from Islamic State group-controlled territory (Photo: AP)