SAN FRANCISCO – While Southern California’s famous sunshine was finally making a return appearance Wednesday, the region’s counterparts to the north were not as fortunate as rain continued to pelt large swaths of water-logged terrain.  

“The atmospheric river has refocused over northern and central California,” the National Weather Service said. “Heavy rain on saturated soils and gusty winds may lead to flooding and damaged or downed trees and power outages.”

The service warned of hazardous weather conditions for the San Francisco Bay Area and the Monterey peninsula to its south. There was a wind advisory in place until Wednesday evening and a high-surf advisory going into effect Thursday.

An atmospheric river happens when a line of warm, moist air flows from near the islands across the Pacific Ocean to the West Coast, which falls as heavy rain when it reaches cooler air over land. These “rivers in the sky” can be more than 1,000 miles long and carry more water than the Mississippi River.

It all added up to further misery for a region that has endured a relentless string of atmospheric rivers since the final week of 2022. The 12.37 inches of rain San Francisco received from Dec. 26 through Monday represent more than half its typical yearly total and the city’s third-highest amount ever over 15 days, meteorologist Jan Null tweeted.

WHAT IS AN ATMOSPHERIC RIVER?These rivers of water vapor can extend thousands of miles.

At least 17 people have died in the wave of ferocious storms. Damage could exceed $1 billion, experts say. And yes, more of the same is coming.

“We’re not out of the woods,” Gov. Gavin Newsom warned.

MORE STORMS ON THE WAY:4 more storms heading toward California in next 10 days, Newsom warns

NEW NORMAL?:Are California’s storms normal, or is climate change making them worse? What experts say.

Other developments:

►Ventura and Santa Barbara counties, both northwest of Los Angeles, combined for 13 locales that registered two-day rain totals of at least 13.2 inches as of Tuesday at 3 p.m. according to the National Weather Service’s LA office.