Ice floes are viewed by the Intrepid Sea, Air & Space Museumn in New York City, the United States, on Feb. 20, 2015. New York City Emergency Management has issued a weather alert for dangerous cold temperatures for Feb. 20, followed by a wintry mix of snow, sleet and freezing rain. A bitterly cold chill known as the "Siberian Express" has enveloped much of eastern America, sending temperatures plummeting below their normal February levels to record lows in at least 100 places. (Xinhua/Wang Lei)
