Climate Central: Its looking more and more certain that an El Nio is in the works and could arrive as soon as early summer -- bringing with it warmer global average temperatures, fewer Atlantic hurricanes, and possible drought relief for the U.S. West -- according to the latest forecast from the National Oceanic and Atmospheric Administration, released Thursday. The chance of an El Nio developing this summer has increased to 65 percent from 50 percent last month, and forecasters are now favoring an onset during...