It could get down to sea level in a few spots. There will also be pockets where you get cold air down to the valley floors such as in the North Bay valleys. "I think snow is a given above 2,500 feet with this storm," Null said. Jan Null, a forecaster with Golden Gate Weather Services, said forecasting snow in the Bay Area is a "fickle proposition." In order for snow to fall at lower elevations, the cold air and the moisture stream have to line up at just the right time, and it's difficult to know exactly when and if that's going to happen. Napa and Sonoma counties could see dustings on the valley floors. The chance for the heaviest snow comes Thursday night into Friday, with the North Bay likely to measure the highest amounts. "A lot of our cold air ends up being on the drier side." "There are moments when it will be cold enough for snow to fall below 1,000 feet, but the moisture also has to line up at that time," Murdock said. Murdock said snow is possible Wednesday night into Thursday, but this is not when the weather service is predicting the heaviest snow. While there's a chance for rain and snow across the Bay Area from Tuesday through Saturday, the first chance for precipitation comes Wednesday. From Wednesday through Friday, afternoon highs are expected to be in the upper 40s to low 50s in the valleys and along the coastline, and in the mid-30s to low 40s for higher elevations. Temperatures are expected to drop Wednesday morning, marking the start of a cold spell that is forecast to continue into Friday, with overnight lows in the the upper 20s to lower 30s for the interior valleys and in the mid- to upper 30s along the coastlines. Wednesday, with sustained winds of 25 mph to 35 mph and isolated gusts up to 65 mph possible. Keep up with the forecast and stay safe! #cawx /PpR6P6ymdX- NWS Bay Area □ February 21, 2023Īs the system arrives Tuesday afternoon and evening, powerful winds are expected to develop across the region. Here's a quick video update on the the potential for rain, low elevation snow, strong winds, and cold temperatures this week. "Just the way the jet stream is working out, we're seeing it form over land," Murdock said. Murdock said this system is unusual as it has come together over land and will be continuing to form as it pushes into California. The storm was forming over Washington state Tuesday morning and is expected to spread into Northern California on Tuesday. "The odds are you’re going to see white caps on the mountains in the Bay Area," Brayden Murdock, a meteorologist with the weather service's Bay Area office, told SFGATE.
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