Photo of Amy Graff

A woman crosses a street during a rain storm in Alameda, Calif. on Nov 1, 2022.
A woman crosses a street during a rain storm in Alameda, Calif. on Nov 1, 2022.Douglas Zimmerman/SFGATE

Heavy rain soaked California’s San Francisco Bay Area overnight and into Tuesday morning with the precipitation adding up to some impressive totals.

The southern part of the region saw some of the most intense rainfall with many locations across the Santa Cruz Mountains recording over 2 inches and 1 to 2 inches falling across the South Bay. The downpours led to flooding on roadways from Sunnyvale to San Jose.

The South Bay often sees less rain than other parts of the region due to the Santa Clara Valley’s location on the lee side of the Santa Cruz Mountains, but that wasn’t the case with this large and potent storm. “I think it’s the way the system is set up,” said Cindy Palmer, a forecaster with the National Weather Service. “They weren’t as rain shadowed as they usually are. This was a much more dynamic system and I think it allowed the South Bay to see the higher quantities of rain.” 

Many locations in the East Bay saw over an inch of rain while gauges across San Francisco measured from a half inch to over 0.80 inch. Marin County and the North Bay saw a half inch to over an inch of rain, with mountains and ridgetops recorded the highest totals. 

Here’s a look at some 24-hour rainfall totals in inches for locations across the Bay Area as of 8 a.m.

– Scotts Valley: 2.82

– Boulder Creek: 2.47

– Big Basin: 2.28

– Cupertino hills: 2.08

– Sunnyvale: 1.87

– Mount Umunhum: 1.78

– Santa Clara: 1.77

– Los Altos: 1.61

– Woodside: 1.45

– Venado: 1.39

– Hayward Air Terminal: 1.35

– Dublin: 1.27

– Las Trampas: 1.2

– Vacaville Nut Tree: 1.1

– San Jose International Airport: 1.18

– San Francisco International Airport: 0.83

– Oakland Metro: 0.84

– Mount Tamalpais: 0.81

– Downtown San Francisco: 0.66

The system is expected to exit the region today with scattered showers, thunderstorms and hail in the forecast into the evening. “We’re going to see showers pop up through day,” Palmer said.