![]() ![]() Some of this fog also has a chance of making it to the Napa, Sonoma and Petaluma valleys by 8 a.m. North Bay: A mix of shallow fog on the Sonoma County coast and high fog in Mill Valley will spread into the bayside on Wednesday morning, including Sausalito, Tiburon and Vallejo. This veil of clouds will keep nighttime lows on the Peninsula in the lower 50s by the coast and bayside and around the 50-degree mark in the east-facing hillsides - including San Andreas Lake and Emerald Hills. Weather models forecast the fog returning to Highway 1 and lifting to high fog along Highway 92 Wednesday evening and into the overnight hours. The Santa Cruz Mountains will shield residents south of Millbrae and along Interstate 280 and Highway 101 from most of Thursday’s fog, allowing daytime highs to reach the lower 60s in Menlo Park, Atherton and Stanford. Expect winds to pick up again along the coast and bayside from 2 to 6 p.m., with afternoon gusts reaching 20 mph at times. Sunshine will break through the fog by noon, warming the immediate coast and the San Bruno gap - including Daly City, Millbrae and San Mateo - to the lower 60s. ![]() Peninsula and Pacific Coast: A cool and misty Wednesday morning is on tap between Pacifica and Half Moon Bay, with patches of fog and drizzle possible along Highways 1 and 92 through 10 a.m. Look for mostly cloudy skies after sunset and nighttime lows that will stay just above 50 degrees. ![]() The fog and chilly winds will then gradually return to the coast while high fog spills east of Sutro Tower and into the rest of the city by the evening. Warmer air will build over the Castro, Mission, SoMa and downtown areas Tuesday afternoon, leading to daytime highs briefly reaching the upper 60s. Look for daytime highs in the lower 60s by the water, including the west side, Presidio, Embarcadero and Hunters Point. And with the exception of a few patches of fog around Twin Peaks, expect sunshine to clear out most of the fog by noon. High fog is also likely to flow over the rest of the city, making for gloomy conditions through 11 a.m. San Francisco: The ebb and flow or marine clouds will continue on Wednesday, starting with this morning’s cool, misty weather in the Sunset and Richmond districts. But don’t get too used to the cooler air. Like the weather pattern that played out last week, weather models expect the jet stream to pick up the cutoff low by Friday, taking it out to Alaska and exposing the Bay Area to warmer weather once again this weekend. This means cities like Sacramento and Fresno that reach the mid-90s on Wednesday will only fall to the upper 80s by Friday.Īll in all, most Bay Area residents will experience some form of a cooldown over the next few days, with less relief for inland valley residents and those living in California’s interior. The Central Valley will only experience less than half of that relief - at most. These winds will act as an atmospheric freeway for cool air between the Pacific Ocean and Central Valley.īut natural barriers like hills and mountains will limit most of the heat relief in the inland valleys of the North Bay and East Bay, where a 6 to 10-degree cooldown is on tap this week - upper 80s on Wednesday will fall to the mid-70s by Friday. Winds are likely to increase from Wednesday through Friday during the afternoon and evening hours, with gusts reaching 25 to 30 mph along the immediate coastline and the delta region near Benicia, Vallejo and Concord. Wednesday evening’s winds are likely to spill into the delta and Central Valley, leading to some heat relief for inland cities like Walnut Creek, Sacramento and Fresno. Some of this cool, misty air will be stretched out across the wider Bay Area. The abundance of fog and cool air along the coast and bays will keep daytime highs in cities like San Francisco and Oakland around the mid-60s through Friday. This week’s cut-off low won’t carry much in the way of moisture, but simulations on the European weather model raise a high chance of fog and chances for drizzle on the coast over the next few days. The low-pressure system is forecast to churn counterclockwise winds just west of California, while the prevailing flow of the jet stream will continue to travel toward Alaska. The European weather model’s projection of winds at 300 millibars in the atmosphere - roughly 30,000 feet above sea level - on Wednesday. If that sounds familiar it’s because a very similar setup occurred over the Bay Area earlier this month, leading to a brief cooldown between hotter, drier weather. Wednesday’s weather will be centered around a low-pressure system that’s been cut off from the usual west-to-east flow of the jet stream. ![]()
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