Dense fog advisory for Northern Colorado until Thursday morning – limited visibility

Published Dec 4, 2025

The National Weather Service issued a dense fog advisory at 9:22 p.m. on Wednesday in effect until Thursday at 10 a.m. for Larimer County below 6,000 feet/Northwest Weld County and Central and South Weld County as well as Morgan County.

The NWS adds to prepare for, “Visibility one quarter mile or less in dense fog.”

“Low visibility will make driving conditions hazardous,” adds 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 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 also activate your taillights. If you have fog lights, use 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:

Keep a considerable following distance to account for sudden stops or shifts in traffic patterns.

Stay in your lane:

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

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.

No 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.

Source: The National Weather Service