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Dense fog advisory for 5 Freeway through Grapevine until Saturday midday – visibility down to 1/4 mile

December 12, 2025

5 Freeway through Grapevine is the focus of a dense fog advisory issued at 7:02 p.m. on Thursday by the National Weather Service. The advisory is in effect until Saturday Dec. 13, at 11 a.m.

“Visibility one quarter mile or less in dense fog for elevations between 1,000 and 2,500 feet,” can be anticipated according to the NWS Hanford CA. “Mountain Highways included but not limited to: 41, 58, 152, 168, 198 and Interstate 5. With little change in conditions, the dense fog will remain all day.”

“Sudden encounter of low visibility could make driving conditions hazardous,” the NWS said. “If driving, slow down, use your headlights, and leave plenty of distance ahead of you.”

The full list of affected locations includes:

5 Freeway through Grapevine
West Side Mountains north of 198
Coalinga – Avenal
West Side Mountains South of 198
South End San Joaquin Valley
Mariposa Madera Foothills
Mariposa-Madera Lower Sierra
Fresno-Tulare Foothills
Fresno-Tulare Lower Sierra
South End Sierra Foothills
South End of the Lower Sierra
Tehachapi
Frazier Mountain Communities
Buena Vista County

Fog safety: Tips from the NWS for safe travels

When a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility can plummet to a quarter-mile or less. These conditions pose challenges for travel, so exercise extra caution on the road or consider postponing your trip if possible.

If you must venture out in foggy conditions, keep these safety tips from the NWS in mind:

Reduce speed:

Slow down and allow extra travel time to reach your destination safely.

Visibility priority:

Ensure your vehicle is visible to others by using low-beam headlights, which also activate your taillights. If available, employ your fog lights.

Avoid high-beams:

Refrain from using high-beam headlights, as they create glare that impairs your visibility on the road.

Keep a safe distance:

Leave a safe distance between you and the vehicle in front of you to account for sudden stops or changes in the traffic pattern.

Stay in your lane:

Use the road’s lane markings as a guide to remaining in the correct lane.

Zero visibility protocol:

In cases of near-zero visibility due to dense fog, activate your hazard lights and seek a safe spot, like a nearby business parking lot, to pull over and stop.

No parking options:

If no designated parking area is available, pull your vehicle as far off the road as possible. Once stationary, deactivate all lights except the hazard flashers, engage the emergency brake, and release the brake pedal to ensure your tail lights remain unlit, minimizing the chance of other drivers colliding with your stationary vehicle.

By adhering to these recommendations from the NWS, you can navigate foggy conditions with greater safety, mitigating the risk of accidents and prioritizing your well-being.

For more local weather alerts, visit our Weather Advisory page

Dense fog advisory for 5 Freeway through Grapevine until Saturday midday – visibility down to 1/4 mile Orange County Register

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Dense fog advisory for 5 Freeway through Grapevine until Saturday midday – visibility down to 1/4 mile

Fog safety: Tips from the NWS for safe travels

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