A cold and moist airmass resulted in the formation of dense fog along the Colroado River valley extending from New Castle, to Rifle, to Grand Junction, and then westward along I-70 toward Green River, Utah.
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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.
A cold and moist airmass resulted in the formation of dense fog along the Colroado River valley extending from New Castle, to Rifle, to Grand Junction, and then westward along I-70 toward Green River, Utah.
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 22, 3:50 PM MST, 11 hours 10 minutes earlier.
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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 frequently reduced visibilities to below one quarter of a mile. Between the Redlands area of Grand Junction and the Grand Junction Regional Airport, visibilities were reported to be between 100 ft. and one quarter of a mile.
Dense fog frequently reduced visibilities to below one quarter of a mile, especially in low lying areas nearest to the Colorado River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2009Every state in 2009This day in weather historyWarnings in Colorado, December 2009
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: 203116, 203117.