After a day filled with spotty showers, widespread rain was expected to return to the Bay Area late Monday and into Tuesday, according to forecasters.
The wet weather will trigger a flash flood watch for the North Bay and coastal mountains beginning at 10 p.m. before expiring at 4 a.m. on Tuesday. Residents hunkering down in those locations should expect street flooding, standing water and possible mudslides.
Wind advisories will also go into effect for all nine Bay Area counties when the storm arrives around 9 p.m.
In the Montclair neighborhood of Oakland, trees are coming down and, at times, the earth is moving with them.
"Now, every time it rains, more of the hillside keeps coming down," said Satoko Davidson. "There's a huge amount of earth that just keeps seeping through."
In Danville, public works crews raced to replace sandbags along Diablo Road to prevent more mudslides.
Elsewhere in the East Bay, tree cutter Russell Duda said he has been busy around the clock throughout the East Bay.
"Just inundated," he said. "I'm just hoping the rain subsides."
The rain is expected to partially taper off during the early morning hours of Tuesday before ramping back up by late Tuesday morning. Soggy conditions are expected to make way for partial clearing by late Tuesday.
In the Santa Cruz Mountains, rainfall totals could top out close to 5 inches by Wednesday. East Bay locations could see approximately four inches of rainfall. Peninsula totals are estimated to reach 3 1/2 inches followed by North Bay numbers hovering around 3 inches. South Bay spots could collect totals around 2 inches.
NBC Bay Area's Elyce Kirchner contributed to this report.