Blizzard, Northeast Big Horn Mountains
- When
- April 9, 7:00 PM MST to April 10, 2:00 PM MST
- Where
- Northeast Big Horn Mountains forecast zone
- Reported by
- TRAINED SPOTTER
Blizzard and High Wind in Wyoming, April 9 to 10, 1999
A low pressure system developed over Utah during the afternoon of April 9 and moved into Wyoming that evening. This system crossed Wyoming overnight then moved into South Dakota.
The toll
- 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.
What happened
The episode as NWS BYZ wrote it up.
A low pressure system developed over Utah during the afternoon of April 9 and moved into Wyoming that evening. This system crossed Wyoming overnight then moved into South Dakota. The storm produced between 18 and 36 inches of new snow in the Burgess Junction area. The heavy snow combined with northerly winds between 25 and 50 mph to produce blizzard conditions in the northeast Big Horn Mountains. This system also produced northwest winds sustained at 40 mph twice during the morning of April 10 at the Sheridan airport.
Event by event
1 blizzard, 1 high wind. Local standard time, as filed.
High Wind, Sheridan Foothills
- When
- April 10, 4:00 AM MST to 6:00 AM MST
- Where
- Sheridan Foothills forecast zone
- Measured
- 45 kt (52 mph)
- Reported by
- AWOS,ASOS,MESONET,ETC
What these are
- 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.
- High Wind
- Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Ohio, April 9, 1999
- Tornadoes and Damaging Wind in Indiana, April 9, 1999
- Tornado in Indiana, April 9, 1999
- High Wind in Colorado, April 9 to 10, 1999
- Tornado in Indiana, April 9, 1999
- Flash Flooding and Hail in Pennsylvania, April 9 to 10, 1999
- Hail and Damaging Winds in Virginia, April 9, 1999
- Damaging Wind in Indiana, April 9, 1999
- Tornado and Damaging Winds in Virginia, April 9, 1999
- Damaging Winds in Ohio, April 9, 1999
- Hail and Damaging Winds in West Virginia, April 9, 1999
- Damaging Wind in Indiana, April 9, 1999
More
Every storm in Wyoming in 1999Every state in 1999This day in weather historyWarnings in Wyoming, April 1999
Sources
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: 5696235, 5696236.