5 Freeway through Grapevine is included in a dense fog advisory issued by the National Weather Service on Wednesday at 2:31 a.m. The advisory is in effect until 11 a.m.
“Visibility one quarter mile or less in dense fog for elevations between 1,000 and 2,500 feet,” can be expected according to the NWS Hanford CA. “Mountain Highways included but not limited to: 41, 58, 152, 168, 198 and Interstate 5.”
“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

Guidance from the NWS for navigating foggy conditions
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 driving in fog becomes unavoidable, remember these safety tips:
Reduce speed:
Slow down and allocate 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 lights, as they create glare, making it more difficult for you to see what’s ahead of you 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 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 no parking area is available, pull your vehicle as far to the roadside as possible. Once stationary, turn off all lights except the hazard flashers, engage the emergency brake, and release the brake pedal to ensure your tail lights are not illuminated, reducing the risk 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