Dense Fog in San Juan River Basin, Colorado

Dense Fog January 1, 2026 – January 2, 2026 · San Juan River Basin, Colorado

What the National Weather Service wrote

Patchy dense fog developed within the San Juan River Basin overnight on January 1 and 2. The KPSO AWOS at the Stevens-Pagosa Springs Airfield reported brief 1/4-mile visibility from dense fog near midnight. No reports of injuries, damages, or fatalities were received.

The wider storm

A deep Pacific trough brought moist southwesterly flow to much of the western CONUS on January 1. A weak upper-level jet streak arrived in coincidence with the surge of moisture, prompting widespread precipitation in western Colorado throughout the morning of the 1st. Strong cold air advection behind the storms rapidly saturated valleys, and areas of dense fog developed during throughout the night and into the morning of January 2.

Source: NOAA Storm Events Database, event 1309212. Narratives are written by the National Weather Service forecast office that issued the report.

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