An upper low moved across Wyoming producing a deep, upslope flow against the Beartooth/Absaroka Mountains and adjacent foothills, which resulted in heavy snow amounts.
Every event with a place to put it; 5 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 BYZ wrote it up.
An upper low moved across Wyoming producing a deep, upslope flow against the Beartooth/Absaroka Mountains and adjacent foothills, which resulted in heavy snow amounts.
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 Billings, MT wrote its last area forecast discussion before the first event at Apr 3, 6:50 PM MST, 10 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
5 winter storm. Local standard time, as filed.
Area SNOTELS reported anywhere from 9 to 25 inches of new snow.
Mystic Lake reported 18 inches of new snow.
Snowfall amounts up to 12 inches were reported in the Red Lodge area. As a result of the heavy, wet snow, a roof of a business collapsed.
Snowfall amounts of 8 to 20 inches were reported across the area.
Snowfall of 6+ inches was observed by NOHRSC.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2023Every state in 2023This day in weather historyWarnings in Montana, April 2023
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: 1086608, 1086609, 1086610, 1086612, 1086607.