Recent precipitation combined with colder temperatures and clear skies to allow dense freezing fog to form in portions of Sheridan County.
Every event with a place to put it; 1 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 GGW wrote it up.
Recent precipitation combined with colder temperatures and clear skies to allow dense freezing fog to form in portions of Sheridan County.
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
At the Plentywood airport mesonet site (KPWD), visibility dropped to a quarter mile or less for almost 6 hours in the early morning of the 10th. Similar conditions were observed by the web cam at the Comertown Turn-Off MT-5 DOT site.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2021Every state in 2021This day in weather historyWarnings in Montana, March 2021
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: 948346.