Wyoming, 2020Blizzard and Winter Storm in Wyoming, October 21 to 22, 2020
October 21 to 22, 2020 · NWS BYZ · 2 events in 2 counties and zones
A strong disturbance aloft combined with a deep upslope flow resulted in heavy snow to the Big Horn Mountains and adjacent foothills.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 2
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.
A strong disturbance aloft combined with a deep upslope flow resulted in heavy snow to the Big Horn Mountains and adjacent foothills.
Blizzard, Northeast Bighorn Mountains
- When
- October 21, 8:00 PM MST to October 22, 4:00 PM MST
- Where
- Northeast Bighorn Mountains forecast zone
- Reported by
- SNOTEL
- Coordinates
- 44.790, -106.879 (the zone’s center; the record gives no point)
Snowfall of 6 to 9 inches, blowing snow and near zero visibility at times was reported.
Winter Storm, Sheridan Foothills
- When
- October 21, 10:15 PM MST to October 22, 4:00 PM MST
- Where
- Sheridan Foothills forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 44.790, -106.879 (the zone’s center; the record gives no point)
Snow, blowing snow and near zero visibility at times was reported across the area.
- Blizzard
- Sustained winds or frequent gusts of 35 mph or more with falling or blowing snow that cuts visibility below a quarter mile for three hours or longer.
- Winter Storm
- A storm that brought snow, sleet or freezing rain at warning levels, usually over several hours or days.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Heavy Snow in South Dakota, October 21 to 22, 202015 events
- Dense Fog in Maryland, October 21, 202014 events
- Dense Fog in Virginia, October 21, 202012 events
- Heavy Snow and Winter Weather in Montana, October 21 to 22, 20209 events
- Heavy Snow in Montana, October 21 to 22, 20206 events
- Heavy Snow in North Dakota, October 21 to 22, 20206 events
- Flooding in Indiana, October 21, 2020$4,000 · 4 events
- Flash Flood and Flooding in Ohio, October 21, 2020$2,000 · 4 events
- Winter Storm in Montana, October 21 to 22, 20204 events
- Flooding in Florida, October 21, 20203 events
- Wildfire in Colorado, October 21 to 31, 20202 events
- Dense Fog in District of Columbia, October 21, 20201 event
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: 920662, 920661.