An active northwest flow set up over Idaho bringing a series of shortwaves into the region over a couple of days. This produced areas of heavy snow, especially in areas that were orographically enhanced.
Every event with a place to put it; 3 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 MSO wrote it up.
An active northwest flow set up over Idaho bringing a series of shortwaves into the region over a couple of days. This produced areas of heavy snow, especially in areas that were orographically enhanced.
The national radar mosaic for the moment the first event began.
3 heavy snow. Local standard time, as filed.
The Lolo Pass SNOTEL reported 16 inches of snow 7 miles SW of Lolo Hot Springs.
The Department of Highways estimated 7 to 9 inches of snow over Lost Trail Pass on Highway 93 and Chief Joseph Pass on Highway 43.
The Dixie co-op observer measured 5.5 inches of snow from the evening of the 13th until the evening of the 14th. Another 6.8 inches of snow was measured from the evening of the 14th to the evening of the 15th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2011Every state in 2011This day in weather historyWarnings in Idaho, November 2011
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: 353955, 353956, 353959.