Live updates: Large tree falls, blocks Foothill Expressway in Los Altos

Flash flooding was a big concern for parts of San Francisco. Some streets were literally under water because so much rain fell in such a short period of time.

Flash flooding was a big concern for parts of San Francisco. Some streets were literally under water because so much rain fell in such a short period of time.

In the Marina District by Marina Boulevard and Divisadero Street, ponding water transformed the road into a river.

It was a similar story in the Mission District by 23rd and Dolores and then at Pine and Masonic streets.

San Francisco Public Works Department says it's the first major storm of the season and they've got their crews working overtime.

"Everyone has their game plan for what we are doing. This is not new in San Francisco, but when the rains get really heavy and the winds start howling, we do our best to keep up. But there is going to be some localized flooding. We're likely to see some trees cone down. We just want to keep people safe," said Rachel Gordon with San Francisco Public Works Department.

In the North Bay, flood concerns on the Russian River. There's a flood warning up for the area and with more rain expected, many are quickly moving to higher ground.

In the North Bay, there are flooding concerns on the Russian River. A flood warning is up for the area and with more rain expected, many are quickly moving to higher ground.

Olivia Lindauer was wasting no time moving her house trailer out of downtown Guerneville. Her neighborhood on Mill Street could be under several feet of water by Saturday.

"It's a pain, not as big pain as moving your entire house that doesn't have wheels but it's still not fun for sure," said Lindauer.

Brianna Holmes is already on the move to higher ground with her trailer.

"Just like getting uprooted from your home and stuff, I have to find somewhere else to live for a few days, pet care - all of it and I'm probably gonna have to miss work too, It's probably the most stress I could have," said Holmes.

Some Guerneville neighborhoods were starting to flood Friday. Firefighters were going door to door, checking on residents.

All eyes on the Russian River, which is expected to reach flood stage soon.

"It's in monitor stage right now, but it's looking at this time to be around 34 feet so you can see the neighborhood where it's a pretty good indication these are the first areas It starts to flood some of the creeks," said Sonoma County Fire District Division Chief, Cyndi Foreman.

Everything that isn't nailed down is being moved up and away from the floor at the Surrey glamping Resort.

The resident cat, is also ready for transport.

The resort sits on a low spot, where flooding is almost guaranteed.

"Today, we're basically having the staff clear everything out of the flood area, we'll clean the tents off before next season and we will be ready to go," said Surrey Resort manager, Joey Luiz.

An RV on the property got stuck in the rising water and mud.

In Healdsburg, heavy rain caused a mudslide on Buena Vista Drive. City public works crews are waiting for dryer weather before they can shore up the hillside.

Back in Guerneville, it's time for neighbors to move out.

"See you in a couple of days home, don't go anywhere," said Lindauer.

In the South Bay, many people spent the earlier part of Friday preparing ahead of afternoon and evening rain.

In the South Bay, many people spent the earlier part of Friday preparing ahead of afternoon and evening rain.

Workers and volunteers at Christmas in the Park in San Jose focused on protecting many of the displays and structures with sandbags.

"We open on the day after Thanksgiving, on November 29. The rainy days are my most favorite days in the park, because there's fewer people here, and all of the lights just kind of glisten, and it's just magical," said Debbie Degutis, managing director, Christmas in the Park, "So that's when I think people should come down here."

Still, precautions are being taken.

"We're prepping for the rain. We're putting sandbags out just to protect some of our displays. But all these displays are designed and built to be in the rain, the wind, the sun, and they're going to be just fine," Degutis said.

Valley Water made sandbags available at stations throughout the county and have been asking residents to stay alert.

"We've been messaging out to the public to make sure that they're prepared as the wet season starts," said Matt Keller, Valley Water spokesperson, "So, we're asking everybody to make sure that they have an emergency plan in place in case there is flooding,"

San Jose resident Dan McCarthy taking no chances and making sure his family doesn't, either.

"My son's got a shed in the back that has a low point by the by the door, so I thought I'd take a little preventive action today," said McCarthy.

Right now, the hope from officials is that the rain will have as minimal of an impact as possible on residents like McCarthy and his son and instead bring benefits.

"We're hopeful that this will just be good for our water supply," Keller said. "Although we're not expecting a lot of water to go into our reservoirs, this does soak the ground so that the next storms that come into Santa Clara County can start getting that runoff into our reservoirs and filling up our reservoirs."

As intense storms continue hitting our region, the East Bay was getting drenched with rain on Friday.

As intense storms continue hitting our region, the East Bay was getting drenched with rain on Friday.

In Berkeley, Sharetea manager Daniel Marroquin said the bad weather has been good for business over the past few days, with customers opting for more hot tea options.

"They stay inside, get the hot drink. They stay warm a bit, and then they leave," Marroquin said.

The bad weather was not making everyone's jobs better though.

Outside the tea shop, we ran into FedEx worker Michaelangelo Rosales.

Rosales said the rain can destroy many of the packages he's delivering.

"It soils the packages inside. So, we have to bring the packages back and then bring a new batch," he said.

On the campus of UC Berkeley, this weekend is one of the biggest football games of the year.

The school's team is set to play archrival Stanford on Saturday for their annual "Big Game."

The game is expected to attract fans from all across the country.

"Well, my parents went to Cal. I got some other siblings. They went to the farm down there, the junior university. The rivalry, it's fun. It's fun. We always dig on each other on that," said Walter Birmbaum.

Birmbaum is an alumnus and said he and his family came up from San Diego early to attend a planned pep rally Friday outside Sproul Hall.

"We're ready. We have our ponchos, so we're ready for the atmospheric river or whatever they call it these days. So, we're good," he said.

That rally was ultimately canceled as the rain continued to pour down.

Despite the setback, several students say they don't expect it to kill the energy on campus or diminish turnout for the big game.

That includes Isaac Davis and his classmates, who were selling game shirts outside of the hall Friday afternoon.

"It's about the camaraderie. Berkeley, I think rain or shine, we're going to show up. It's one of the biggest games of the year. You know, fight the trees, go Bears," Davis said.