Colorado, 2025Dense Fog in Colorado, December 7, 2025
December 7, 2025 · NWS GJT · 2 events in 2 counties and zones
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.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 2
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
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.
Dense Fog, Central Colorado River Basin
- When
- December 7, 5:15 AM MST to 8:00 AM MST
- Where
- Central Colorado River Basin forecast zone
- Reported by
- AWOS
- Coordinates
- 39.481, -107.172 (the zone’s center; the record gives no point)
Areas of dense fog developed along the high-elevation valleys along I-70 during the morning of December 7. The KEGE AWOS at the Eagle County Regional Airport reported two periods of 1/4-mile visibility due to freezing fog. The first occurrence was before sunrise and brief, lasting less than thirty minutes. The second occurrence lasted about an hour, beginning near sunrise. No reports of injuries, damages, or fatalities were received.
Dense Fog, San Juan River Basin
- When
- December 7, 8:15 AM MST to 8:45 AM MST
- Where
- San Juan River Basin forecast zone
- Reported by
- AWOS
- Coordinates
- 37.194, -107.048 (the zone’s center; the record gives no point)
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.
- Dense Fog
- Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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- Winter Weather in New York, December 7, 20259 events
- Winter Weather in Maine, December 7 to 8, 20258 events
- High Wind in Wyoming, December 7 to 8, 202568 kt wind · 4 events
- Marine Thunderstorm Winds in South Atlantic Coastal Waters, December 7, 20254 events
- Winter Storm in North Carolina, December 7 to 8, 20253 events
- Winter Weather in Indiana, December 7, 20252 events
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1302441, 1302442.