A strong jetstream with wind speeds of over 120 knots was over western Montana and north central Idaho. During the day, some of the stronger winds aloft mixed down to the surface.
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 MSO wrote it up.
A strong jetstream with wind speeds of over 120 knots was over western Montana and north central Idaho. During the day, some of the stronger winds aloft mixed down to the surface.
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 Mar 31, 9:15 AM MST, 2 hours 37 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Logan Pass visitors center in Glacier National Park at an elevation of 6775 feet, reported west winds of 51 mph with gusts to 94 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2011Every state in 2011This day in weather historyWarnings in Montana, March 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 2026-09-24. Each event’s entry at NCEI: 284787.