The odds are increasing that an El Nino weather system will form this year, portending drought for Australia and Asia and a warmer winter in the U.S. Northeast. The U.S. Climate Prediction Center now says there’s a 65 percent chance the Pacific Ocean warming pattern will develop after August. It put the odds at 52 percent last month. The Australian Bureau of Meteorology, which expected neutral conditions at the start of the year, says the phenomenon may start as soon as July. The World Meteorological Organization of the United Nations sees an El Nino at midyear.