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Atmospheric River Drenches Northern California With Historic Rainfall – CBS San Francisco

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SAN FRANCISCO (CBS SF) – A cyclone off the northwest coast targeted a strong atmospheric river in northern California on Sunday and dropped a staggering amount of rain in parts of the Bay Area over a 24-hour period, weather officials said.

The National Weather Service determined that the storm system should make October 23rd the ninth day of the heaviest rainfall in downtown San Francisco since rainfall records began in 1849.

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With persistent rain, the total rainfall on Sunday for San Francisco could rise to the seventh largest rainfall of all time.

Over all months / days for a period of 24 hours, this day will already occupy the 9th of all time. There is definitely a chance of getting to 7th place. Harder to get beyond and number 1 seems very unlikely. pic.twitter.com/A4soFMW3Ba

– NWS Bay Area (@NWSBayArea) October 25, 2021

As the storm’s strongest concentration of precipitation gradually shifted south, parts of the Santa Cruz Mountains began to see significant increases in rainfall, ranging from three to ten centimeters to over eight centimeters in the past 24 hours.

The wettest place in the Bay Area was Marin County in Kentfield, where nearly 12 inches of rain had fallen by 7 p.m.

24-hour rain sums and the radar almost 7 p.m.: Heavy rain continues to fall on already saturated ground. San Francisco has gained 3.28 “since midnight, making this the 13th rainiest day on record since 1850, and we’re breaking the October record every hour. @KPIXtv #CAwx pic.twitter.com/48TK05ZS72

– Paul Heggen (@PaulKPIX) October 25, 2021

Heavy rains at 12:30 p.m. triggered a flood warning for the Hennessey portion of the LNU Lightning Complex burn area in Napa and Sonoma counties

buy isotretinoin online 30mg KPIX 5 weather center: Current conditions, maps, forecasts for your region

“Doppler radar and automatic rain gauges indicated that heavy rainfall was falling over the Hennessey portion of the LNU Lightning Complex Burn Area,” the weather service said. “The expected rate of precipitation is 0.75 to 1 inch in 1 hour. Additional rainfall of up to 1 inch is possible in the warned area. Flash floods are underway or are expected to begin shortly. “

The National Weather Service later extended flood warnings for areas in the Napa, Sonoma, and Marin counties to 9:00 p.m.

Flood warning extended to 9:00 p.m. for parts of Counties Napa, Sonoma and Marin. #cawx pic.twitter.com/EzWQNhURjT

– NWS Bay Area (@NWSBayArea) October 25, 2021

While most flood warnings in the Bay Area were allowed to expire at 11:00 p.m., the National Weather Service extended a flood warning for the Santa Cruz district to 3:00 a.m.

Due to heavy rainfall, a flood warning was issued for the Santa Cruz district until 3 a.m. #Cawx pic.twitter.com/RCIWrNjcpy

– NWS Bay Area (@NWSBayArea) October 25, 2021

In addition to the floods in Santa Rosa, which resulted in some evacuations and extensive road flooding in San Rafael, the National Weather Service has also issued an Urban and Small Stream Flood Advisory for much of the East Bay covering Contra Costa and Alameda counties includes departure at 7:15 p.m.

The San Francisco National Weather Service has issued a flood guide to cities and small rivers. https://t.co/jR9Pc3J1po #CAwx pic.twitter.com/9TighR6JUa

– NWS Bay Area (@NWSBayArea) October 24, 2021

Winds above 50 mph were also a problem as they howled across the Bay Area, toppling dozens of drought-weakened trees, crashing them onto cars and power lines, and forcing residents of San Francisco’s Forest Hill neighborhood out of their homes.

The National Weather Service issued a wind warning for much of the area by 8:00 p.m. when a strong atmospheric river roared into the Bay Area, grabbing nearby gale force winds and driving rain showers.

“Peak gusts were around 70 mph on higher peaks, with gusts of 40 to 80 mph filtered into lower areas,” the weather service said. “Expect the winds to linger within the main rainband, but reduce them before the rain subsides.”

From Santa Rosa to San Francisco, work teams were dispatched to the neighborhoods to clean up the fallen trees and large branches.

In San Rafael crashed on Las Pavadas Ave. a large tree on top of a car while the lower Great Highway in San Francisco between Moraga and Lawton was temporarily closed in both directions by another tree that was knocked down in the wind.

In San Francisco’s Forest Hill neighborhood, fire officers issued a mandatory evacuation warrant for houses along one block of 9th Avenue. A 30 meter high tree tilted dangerously and threatened at least three buildings.

The National Weather Service said the storm’s arrival in San Francisco was slightly ahead of schedule on Saturday night with steady rains.

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“If anything, the precipitation is above average with values ​​around 1.25 for downtown San Francisco,” said weather forecasters in the update at 3:45 am. “In the last hour alone, Mount Tamalpais reported 0.79 inches with 6-hour values ​​of 3.34 inches overnight. This is of course one of the wettest spots. “

Atmospheric flux has been raised to Category 5, the highest accolade on the Extreme Weather Laboratory scale of the Scripps Institution of Oceanography, and has sparked a litany of severe weather warnings and guards for the Bay Area.

Authorities have issued an evacuation order for hundreds of homes in and around the burn scar zone of the CZU Lightning Complex in the Santa Cruz Mountains. The order goes into effect on Sunday at 8 a.m. in parts of San Mateo and Santa Cruz counties.

“In the Santa Cruz Mountains it will go downhill quickly in the afternoon hours,” warned the weather service.

But many Boulder Creek residents told KPIX 5 they would ignore the order and try to weather the storm, which could dump up to six inches of rain on slopes that have just started from massive flames that burned 86,500 acres again too overgrown.

“Yeah, we’re sticking to it,” said Steven Coleman, a resident of Boulder Creek. “Where else should we go?”

Those who stayed said they had experience dealing with large storms, evacuation fatigue, and fear of looting.

“We’ll stay until it gets unsafe,” said Coleman.

“We decided to stay,” said another resident of Gloria Sitz.

Most people like Sitz either stayed with family and friends or paid for hotel rooms for more than a month during last year’s CZU fire evacuation. They said they don’t want to deal with it anymore.

“At my location we have a generator, we have chainsaws, we know how to use them and we are prepared,” said Sitz.

The weather service also warned of flooding in the north bay, particularly around the Russian River. A rockslide fell on Mark West Springs Rd overnight. near Fox Lane.

There has already been flooding at Colgan Creek near Sebastopol, where the water level had risen to 76.5 feet on Sunday morning.

“If the atmospheric flow comes to a standstill over the Russian River Basin for even a few hours, we need to watch the trends closely,” said the weather service. “More worrisome are some of the more noticeable streams from the Russian Basin such as Mark West and those near the base of Mount Tamalpais such as San Anselmo and Corte Madera.”

The main impulse of the strong subtropical moisture cloud was still aimed at North Bay on Sunday morning but would be on the move.

“The main atmospheric river will fall around the Golden Gate around 2:00 pm this afternoon,” said the weather service. “In this timeframe, expect several hours of very heavy rain to hit the urban corridors, including 101/280 in the Peninsula and 880/680 in East Bay.”

The threat of heavy rains has also already forced the Alameda County Fair, Danville Fallfest and Oakland Zoo to close on Sunday.

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Meanwhile, the turf at Levi’s Stadium will weather its toughest weather challenge ever when the San Francisco 49ers v Indianapolis Colts kicks off at around 5:30 am

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