"This can start to happen in the wintertime after we've gotten some good rain on the ground, and we have had some rain on and off the past few weeks," Sarah McCorkle, a meteorologist with the National Weather Service's Bay Area office, said.
"High pressure has a general sinking motion, and right now there's low scale sinking motion across the area," she explained. "That helps the fog stay squished toward the ground, high pressure promotes more stagnant squished air."
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