Dense fog formed in some lower valleys in western Colorado as low level moisture remained trapped under shallow surface-based inversions.
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.
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.
The episode as NWS GJT wrote it up.
Dense fog formed in some lower valleys in western Colorado as low level moisture remained trapped under shallow surface-based inversions.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before the first event at Dec 12, 6:54 AM MST, 6 minutes earlier.
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</html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</html>The national radar mosaic for the moment the first event began.
2 dense fog. Local standard time, as filed.
Dense fog occurred across portions of the Lower Dolores River Basin with visibility at the Nucla's Hopkins Field Airport down to a quarter mile.
Dense fog occurred in portions of the Grand Valley with the visibility at the Grand Junction Regional Airport down to a quarter mile.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2015Every state in 2015This day in weather historyWarnings in Colorado, December 2015
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 2026-09-30. Each event’s entry at NCEI: 659883, 659881.