CPC sees 70% chance of weather effect through Summer and more than 60% will last through Autumn.
The weather effect appeared a couple days ago for the first time since 2010.
"Unfortunately, this El Niño is likely too little, too late and too weak to provide much relief for drought-stricken California, as California's rainy season is winding down," said Mike Halpert, deputy director of the Climate Prediction Center at the National Oceanic and Atmospheric Administration.
The longer it persists, the more likely it is to help end the drought in California.
