Bay Area weather alerts: Flood watch, high surf advisory

An atmospheric river storm system hitting Northern California this week has triggered multiple weather alerts, including a flood watch and high surf advisory in parts of the Bay Area.

The flood watch is in effect in Sonoma, Napa and Marin counties from 4 a.m. Wednesday through 4 a.m. Saturday, according to the National Weather Service.

Excessive rainfall could cause creeks, streams and rivers to rise, resulting in flooding in some areas, the weather service said. Ponding could also occur in low-lying areas and on roadways.

Dangerous coastal conditions prompted the weather service to issue a high surf advisory for beaches up and down the Bay Area coastline, excluding the Santa Cruz area, where a beach hazard statement was issued instead. Both alerts are in effect from 6 a.m. Wednesday to 6 a.m. Friday.

Areas under the high surf advisory could see large breaking waves peaking anywhere from 14 to 19 feet, according to the weather service. Waves at exposed west-facing beaches could climb to 22 feet.

A wind advisory was in effect across the North Bay, along the San Francisco Bay shoreline, and up and down the Peninsula coastline from 10 p.m. Tuesday until 6 a.m. Thursday, according to the weather service.

Visit NBC Bay Area's weather page for the latest storm updates and forecast information.

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