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Dense fog advisory issued for 5 Freeway through Grapevine until Saturday midday – visibility as low as 1/4 mile

December 12, 2025

5 Freeway through Grapevine is the focus of a dense fog advisory issued at 2:49 a.m. on Friday 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,” according to the NWS. “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

If a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility often drops to just a quarter-mile or less. These conditions can make driving challenging, so exercise extreme caution on the road, and if possible, consider delaying your trip.

If you must drive in foggy conditions, keep the following safety tips in mind:

Moderate your speed:

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

Visibility matters:

Ensure your vehicle is visible to others by using low-beam headlights, which automatically activate your taillights. Utilize fog lights if your vehicle is equipped with them.

Avoid high-beams:

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

Keep a safe distance:

Maintain a generous following distance to account for abrupt stops or shifting traffic patterns.

Stay in your lane:

To ensure you are staying in the correct lane, use the road’s lane markings as a guide.

Zero visibility strategy:

In situations of near-zero visibility due to dense fog, activate your hazard lights and seek a secure location, such as a nearby business’s parking lot, to pull over and come to a stop.

Limited parking options:

If there is no parking lot or driveway to pull into, pull your vehicle off to the side of the road as far as possible. Once you come to a stop, turn off all lights except your hazard flashing lights, set the emergency brake, and take your foot off of the brake pedal to be sure the tail lights are not illuminated so that other drivers don’t mistakenly run into you.

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 issued for 5 Freeway through Grapevine until Saturday midday – visibility as low as 1/4 mile Orange County Register

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Dense fog advisory issued for 5 Freeway through Grapevine until Saturday midday – visibility as low as 1/4 mile

Fog safety: Tips from the NWS for safe travels

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