Multiple Bay Area counties saw more than 10 inches of rainfall in 48 hours as an atmospheric river pelted the region over the weekend, according to the National Weather Service.
Rainfall collection sites in Danville, Boulder Creek, Mt. Tamalpais and the unincorporated communities of Woodacre in Marin County and Venado and Glen Ellen in Sonoma County all measured double-digit rainfall totals over the weekend.
The NWS’ collection site at Mt. Tamalpais saw the most rainfall of anywhere in the greater Bay Area, with 16.55 inches as of roughly 6:30 a.m. Monday.
Much of the Bay Area also saw wind gusts on Saturday and Sunday as high as 92 mph in Alameda County and upwards of 60 and 70 mph in other parts of the region.
Nearly every county in the greater Bay Area saw seven inches or more of rainfall, according to NWS data. Saint Helena and southwest Yountville in Napa County both eclipsed nine inches as did Boulder Creek in the Santa Cruz Mountains.
In the central Bay Area, rainfall reached between four and five inches in Oakland, Half Moon Bay, Hayward and at the San Francisco International Airport. In San Francisco proper, Sunday’s 4.02 inches of rain alone accounted for the fourth wettest day in the city’s history and set a record for wettest October day.
The previous high in San Francisco for October was 2.48 inches recorded on Oct. 13, 2009. The city’s highest rainfall total for a single day is 5.54 inches recorded on Nov. 5, 1994.
In Sacramento, the 5.44 inches recorded there over the weekend broke the previous record of 5.28 inches set in 1880.
Before Sunday, seven of the 10 highest rainfall totals in the region were recorded in the 1800s, according to a list of totals recorded since 1849 and shared by the National Weather Service.
The sorely needed storm hit the region so hard that it has forced closures of some schools, roadways and freeways due to flooding; mudslides and other debris blocking roadways; and power outages affecting as many as roughly 147,000 PG&E customers late Sunday night.
Conditions are expected to be more mild the rest of the week, according to the weather service. Tuesday will see a 20 percent chance of rain in most of the Bay Area. Mostly sunny skies are anticipated to return Wednesday.
Bay City News staff writer Jeff Ballinger contributed to this story.