On Wednesday at 2:13 a.m. a dense fog advisory was released by the National Weather Service in effect until 9 a.m. for San Bernardino and Riverside County Valleys.
The NWS San Diego CA adds to prepare for, “Visibility one quarter mile or less in dense fog.”
“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.”

Navigating fog: Safety tips by the NWS
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 allocate extra travel time to reach your destination safely.
Visibility priority:
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:
Maintain a generous following distance to account for abrupt stops or shifting traffic patterns.
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 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