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SAN DIEGO — Forecasters are warning county residents to be careful on the roads Tuesday as dense fog is expected through the morning commute.

A dense fog advisory is in effect until 9 a.m. at the coast and in Vista, Carlsbad, Encinitas, Chula Vista, National City and San Diego. The National Weather Service said visibility could be less than one-quarter mile and fog may extend inland to near the mesas at times.

The fog rolled in Monday afternoon, leading to zero visibility in some areas. At the San Diego International Airport, dozens of flights have been delayed or canceled because of conditions. Check the status of flights arriving and departing from San Diego here.

Drivers are urged to give themselves more time Tuesday morning. Slow down, use headlights and leave plenty of distance between cars.