A strong upper level jet and Pacific moisture brought multiple hours of heavy snow rates and difficult travel across the Clearwater Mountains. South wind gusts up to 50 mph developed ahead of a cold front in Grangeville and vicinity.
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The episode as NWS MSO wrote it up.
A strong upper level jet and Pacific moisture brought multiple hours of heavy snow rates and difficult travel across the Clearwater Mountains. South wind gusts up to 50 mph developed ahead of a cold front in Grangeville and vicinity. Heavy snow briefly developed in Grangeville and vicinity as the cold front passed.
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 Missoula, MT wrote its last area forecast discussion before the first event at Dec 20, 2:55 AM PST, 7 hours 5 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
2 winter weather, 1 heavy snow. Local standard time, as filed.
Clearwater County road officials reported 18 inches of snow in Cardiff, with snowfall rates exceeding one inch per hour. Elk River received around 10 inches of snow, with mountain sites, such as Elk Butte Snotel picking up at least 12 inches.
Dixie received 5.8 inches of snow. Snotel sites along US Highway 2 reported 8 to 13 inches.
South wind gusts of 40 to 50 mph led to areas of blowing snow in Grangeville and vicinity. Two hours of heavy snow was observed in Grangeville, with 4 inches of snow being reported. Other sites picked up 1 to 3 inches of accumulation, including Orofino.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2022Every state in 2022This day in weather historyWarnings in Idaho, December 2022
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: 1063152, 1063153, 1063154.