 It intensified again in mid-2011 and lasted until early 2012.This La Niña, combined with record-high ocean temperatures in the north-eastern Indian Ocean, was a large factor in the 2010–11 Queensland floods, and the quartet of recent heavy snowstorms in North America starting with the December 2010 North American blizzard.The same La Niña event was also a likely cause of a series of tornadoes of above-average severity that struck the Midwestern and Southern United States in the spring of 2011, and drought conditions in the South Central states including Texas, Oklahoma and Arkansas.