A slow-moving, cold air mass over the region and the still un-frozen surface of Fort Peck Lake allowed for a few periods of lake fog to develop and drift across portions of northeast Montana, resulting in dense freezing fog.
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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 GGW wrote it up.
A slow-moving, cold air mass over the region and the still un-frozen surface of Fort Peck Lake allowed for a few periods of lake fog to develop and drift across portions of northeast Montana, resulting in dense freezing fog.
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
This was the last lingering period of dense freezing fog from the same event that occurred over the last few days of November. Visibility at 1/4 mile or less remained at the Poplar RAWS site through these overnight hours.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2015Every state in 2015This day in weather historyWarnings in Montana, 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 2026-10-01. Each event’s entry at NCEI: 605445.