South California was struck by a powerful storm over the weekend causing disruptions like flooding and obstruction of highways, mudflows and toppled trees. The news comes just days after the state controlled a series of wildfires.

Drenching showers and strong winds accompanied the weekend’s arrival of an atmospheric river — a long and wide plume of moisture pulled in from the Pacific Ocean. The National Weather Service’s Sacramento office warned of “potentially historic rain.”

The impact of the downpour was noted in areas of Napa and Sonoma counties, which reported overflowing of rivers, while San Francisco Bay Area reported flooding, which forced street closures in Berkeley and Bay Bridge.

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Power poles were downed and tens of thousands of people in the North Bay were without electricity.

By Sunday morning, Mount Tamalpais just north of San Francisco had recorded a half foot (15 centimeters) of rainfall during the previous 12 hours, the weather service said.

“Some of our higher elevation locations could see 6, 7, 8 inches of rain before we’re all said and done,” weather service meteorologist Sean Miller said.

About 150 miles (241 kilometers) to the north, the California Highway Patrol closed a stretch of State Route 70 in Butte and Plumas counties because of multiple landslides within the massive Dixie Fire burn scar.

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“We have already had several collisions this morning for vehicles hydroplaning, numerous trees falling, and several roadways that are experiencing flooding,” the highway patrol’s office in Oroville tweeted on Sunday. “If you can stay home and off the roads today, please do. If you are out on the roads, please use extreme caution”, according to reports from Associated Press.

The same storm system also slammed Oregon and Washington state, causing power outages affecting tens of thousands of people. Two people were killed when a tree fell on a vehicle in the greater Seattle area.

(With AP inputs)