A moist and unstable Pacific disturbance combined with a Canadian cold front brought heavy snow, gusty winds, and much colder temperatures to the area.
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 BYZ wrote it up.
A moist and unstable Pacific disturbance combined with a Canadian cold front brought heavy snow, gusty winds, and much colder temperatures to the area.
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 7, 2:10 PM MST, 7 hours 50 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 winter storm. Local standard time, as filed.
Snowfall amounts of 6 to 12 inches along with icy roads were reported across the area.
Snowfall amounts of 7 to 9 inches were reported mainly southeast of Roundup toward the Bull Mountains.
Snowfall amounts of 6 to 7 inches along with treacherous roads were reported around Baker.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2013Every state in 2013This day in weather historyWarnings in Montana, April 2013
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: 439778, 439776, 439777.