The National Weather Service tweeted Tuesday afternoon that thunderstorms were spotted 200 miles off the Bay Area coast.
The storm activity is pushing to the north and not expected to impact the region Tuesday, the weather service said, but there's a slight chance of thunderstorms in the Bay Area on Thursday.
Storm activity will most likely hit Napa and Sonoma counties.
"It's part of this same large-scale moisture system coming in from the south that's being steered to the north due to this high-pressure system parked Nevada-Utah," said Jeff Lorber, a meteorologist with the National Weather Service's Bay Area office in an interview with SFGATE. "There's also a tittle trough that's offshore off the Northern California coast. This moisture is being steered between those two systems from south to north."
Lorber said that as of Tuesday night, the chance was at 15% to 20%.
"As of now the greatest chance is over North Bay," he said. "It's still far out. We'll have a better idea tomorrow. As of now, the threat is pretty limited elsewhere [outside the North Bay."
Conditions are likely to be dry. While the chance of lightning is low, the risk that a strike could spark a wildfire is high.
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