Dense fog advisory affecting Southern California until Tuesday morning

Dense Fog Advisory Affecting Southern California Until Tuesday Morning

The National Weather Service office in Los Angeles/Oxnard issued a dense fog advisory early Tuesday at 5:23 a.m. The alert covers multiple regions, including Santa Ynez Valley, Lake Casitas, Ojai Valley, Central Ventura County Valleys, Calabasas and Agoura Hills, the Western and Eastern San Fernando Valley, Southeastern Ventura County Valleys, and parts of Los Angeles.

"Visibility one quarter mile or less in dense fog," reported the NWS. "Near zero visibility may occur at times."

The advisory warns that low visibility can make driving hazardous. Motorists are urged to drive slowly, use headlights, and maintain a safe distance from other vehicles. Those stopping due to dense fog should pull completely off the roadway and turn off their lights. The advisory remains in effect until 9 a.m.

"Low visibility could make driving conditions hazardous," noted the NWS. "If driving, slow down, use your headlights, and leave plenty of distance ahead of you."

According to the National Weather Service, such advisories are issued when dense fog significantly reduces visibility, often to one-quarter mile or less, making travel challenging. Drivers are advised to take extra caution or avoid travel when possible.

Source: The National Weather Service

Safety Tips for Driving in Fog

Drive slowly and keep headlights on low beam.
Maintain extra space between vehicles.
Use fog lights if available.
Pull completely off the road if visibility becomes too poor.

Originally published November 4, 2025 at 5:30 a.m.

Author’s Summary

Dense fog will impact Southern California early Tuesday, reducing visibility to dangerous levels and creating hazardous travel conditions until morning.

Fresno Bee — 2025-11-04