The National Weather Service warned of a “relentless parade of atmospheric rivers" — storms that are long plumes of moisture stretching out into the Pacific capable of dropping staggering amounts of rain and snow.

In the state capital, more than 276,000 customers were without electricity Sunday in the city of about 525,000 residents after gusts topping 60 mph (97 kph) knocked down power lines, according to the Sacramento Municipal Utility District.?

The weather service's Sacramento office said the region should brace for an even more powerful storm system to move in late Sunday and early Monday.?

“Widespread power outages, downed trees and difficult driving conditions will be possible," the office said on Twitter.?

Evacuation warnings were in place for about 13,000 residents of a flood-prone area of Sonoma County north of San Francisco, where the swollen Russian River was expected to overspill its banks in the coming days.?

The state Department of Transportation warned motorists to stay off mountain roads after closing a stretch of U.S. 395 in Mono County due to heavy snow, ice and whiteout conditions along the Eastern Sierra.?

“With the severe nature of this storm, Caltrans is asking all drivers to limit nonessential travel until the peak of the storm has passed,” the department said in a statement.?

The wet weather comes after days of rain in California from Pacific storms that last week knocked out power to thousands, flooded streets, battered the coastline and caused at least six deaths.

The first of the newest, heavier storms prompted the weather service to issue a flood watch for a large swath of Northern and Central California with 6 to 12 inches (15 to 30 centimeters) of rain expected through Wednesday in the already saturated Sacramento-area foothills.?

In the Los Angeles area, scattered rain fell during the weekend while stormy conditions were expected to return Monday, with the potential for up to 8 inches (20 cm) of rain in foothill areas. High surf was expected through Tuesday, with large waves on west-facing beaches.?

Since Dec. 26, San Francisco received more than 10 inches (25 centimeters) of rain, while Mammoth Mountain, a popular ski area in the Eastern Sierra, received nearly 10 feet (3 meters) of snow, the National Weather Service reported.?

The storms won't be enough to officially end California's ongoing drought — but they have helped.

State climatologist Michael Anderson told a news briefing late Saturday that officials were closely monitoring Monday's incoming storm and another behind it and were keeping an eye on three other systems farther out in the Pacific.?
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