SAN FRANCISCO (CBS SF) — The National Weather Service Saturday morning issued a Dense Fog Advisory for parts of the Bay Area.

The advisory for the East Bay, North Bay and West Delta to the San Francisco Bay expired at 11 a.m.

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The NWS Bay Area office tweeted that visibility as low as 1/16th of a mile was reported in Palo Alto, and is down to 1/8th of a mile in San Jose and Oakland.

Travelers are advised to watch out for sudden visibility restrictions in dense fog, allow extra time for travel and leave plenty of space between vehicles on the roadway.

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The National Weather Service has also issued an advisory for marine navigation.

The NWS Oakland Weather Center tweeted out time-lapse video from their Salesforce tower camera that showed the dense fog layer. Fog issues were also expected to impact air travel for SFO and OAK airports through late morning.

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Dense fog is expected to reduce visibility to two to three miles for areas of the San Francisco Bay south of the Bay Bridge.