A periodic climate phenomenon, El Nino has prompted storms to smack southern California this week rather than the Pacific Northwest. But Indonesia and parts of Australia are also affected, except they're too dry.
Hans Gutknecht/LA Daily News/AP
Much of the weather-related attention in the United States focuses on the Golden State, where a series of storms this week have dumped between 8 and 10 inches of rain in the mountains around Los Angeles. States of emergency were declared in five counties – three in southern California.
But forecasters note that the effects of El Niño and its La Niña counterpart, which constitute a see-sawing climate phenomenon in the tropical Pacific, touch virtually every continent.
Its influence on global weather patterns on seasonal time scales "far dwarfs everything else we've got," says Mike Halpert, deputy director of the National Oceanic and Atmospheric Administration's Climate Prediction Center in Camp Springs, Md.
As measured by NOAA criteria, the current El Niño, which arrived last July, has nudged its way into the "strong" category, Mr. Halpert says. Although it is far weaker than similar events in 1982-83 and 1997-98, the current El Niño's intensity places it among the top third of all El Niños since 1950.