1 tornado, as filed by the National Weather Service.
Every event with a place to put it. 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 Cheyenne radar (KCYS), 179 km away, was scanning. The volume nearest the first event began at 16:32 UTC.
1 tornado. Local standard time, as filed.
A brief tornado moved east across Highway 20 near Van Tassel before moving back up into the clouds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 1998Every state in 1998This day in weather historyThe tornado archive for Wyoming, 1998Warnings in Wyoming, May 1998
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: 5641520.