Photo of Amy Graff

Gathered water gathers near the curb during a rain storm in Alameda, Calif. on Nov 1, 2022.
Gathered water gathers near the curb during a rain storm in Alameda, Calif. on Nov 1, 2022.Douglas Zimmerman/SFGATE

Rain pounded the San Francisco Bay Area overnight and into the morning, flooding roadways across the region and making for a messy commute. More rain, thunderstorms and hail are expected on Tuesday as a cold front sweeps across Northern California.

“Everything transpired as expected,” Roger Gass, a meteorologist with the National Weather Service’s Monterey office, said. “A heavier band of rain and even some thunderstorms moved through the Bay Area overnight and are continuing to move through the South Bay and into the East Bay this morning. It feels like a winter storm.”

Heavy downpours flooded streets early this morning; Gass said the most reports were coming from the South Bay and East Bay.

The Sunnyvale Department of Public Safety issued a traffic advisory for flooding at intersection of Fair Oaks and Tasman, and shared images showing a lake of water covering the area. “Never attempt to drive through flooded roads, only 12 inches of fast moving water can carry a small car away,” the department warned. 

The weather service issued a flood advisory for parts of the East Bay, stretching from Fremont to Berkeley. “Rain showers early this morning have created some roadway flooding issues,” the weather service warned. “Be sure to give extra time on your morning commute and do not drive through flooded roads!” KCBS Radio reported that the Westbound I-980 off-ramp at Jackson Street in Oakland was flooded early this morning. 

Gass said there several reports of lightning spread throughout the Bay Area overnight and more strikes are possible today. The strongest storm cells were off the coast over the Pacific early Tuesday, with winds whipping up ocean waters and bringing the potential for funnel clouds. The weather service issued multiple warnings along the coast for waterspouts early today. 

The more concentrated heavy band of rain will be exiting the Bay Area later this morning. 

“We expect isolated and scattered showers and thunderstorms to persist through the day,” Gass said. “We have a very cold air mass above us and that is going to be supportive of seeing some of those small hail reports.”