Rules for classifying the two patterns recently changed.

After years locked in a La Niña pattern, the Pacific is flipping. Major global climate models are now signaling a rapid transition toward El Niño later this year. This has surprised experts.

The powerful weather pattern is expected to shift into gear again around June, NOAA said, though its strength this time ...

SAN FRANCISCO (KGO) -- California has a shot of getting out of the drought, according to some water experts, albeit a very small shot. "We have a chance of getting out of the drought but we're going ...

Add Yahoo as a preferred source to see more of our stories on Google. Heavy rain causes issues for residents in Berkeley, Calif. on Feb. 10, 1998. (Michael Macor/S.F. Chronicle 1998) La Niña is still ...

Add Yahoo as a preferred source to see more of our stories on Google. People walk in the rain in Pasadena during a storm on Nov. 20. (Eric Thayer / Los Angeles Times) Californians can be excused for ...

LOS ANGELES (KABC) -- California appears poised to go from severe drought to torrential rains and widespread flooding with the expected arrival of El Nino this winter. State legislators discussed what ...

LOS ANGELES (AP) — Ed Heinlein surveys the steep mountainside that has repeatedly unleashed tons of mud into the backyard of his Southern California home since a 2014 wildfire and still hopes the ...

FRESNO, Calif. (KFSN) -- Meteorologists with the National Weather Service now say El Nio has a 90% chance of lasting through this winter, and an 85% chance of lasting through early next spring. Action ...

SAN FRANCISCO (AP) A strong storm was forecast for Northern California, prompting officials to issue flash flood watches for several rural areas hit by last year's wildfires. El Nino storms lined up ...