Dense Fog in San Juan River Basin, Colorado

Dense Fog December 7, 2025 · San Juan River Basin, Colorado

What the National Weather Service wrote

Localized dense fog developed in the San Juan River Basin during the morning of December 7. The KPSO AWOS at the Stevens-Pagosa Springs Airfield reported about thirty minutes of freezing fog reducing visibility to 1/4 mile shortly after sunrise. No reports of injuries, damages, or fatalities were received.

The wider storm

A strong plume of atmospheric river moisture arrived on the morning of December 6 from the northwest, bringing rain and snow showers to portions of the Colorado west slope. Overnight, the moisture plume descended southwards, leaving west-central and southwestern Colorado valleys to saturate. Dense fog was able to develop before and near sunrise in these valleys as a result, though poor radiational cooling from cloudy skies kept fog relatively localized and short-lived.

Source: NOAA Storm Events Database, event 1302442. Narratives are written by the National Weather Service forecast office that issued the report.

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