1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 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 Boise radar (KCBX), 101 km away, was scanning. The volume nearest the first event began at 03:29 UTC.
1 flash flood. Local standard time, as filed.
A very slow moving thunderstorm dumped heavy rain upon the Owyhee Mountains of Southwest Idaho. Flash flooding ensued which left one foot of water on highway 78. Numerous dry washes and gullies were flowing with water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 1997Every state in 1997This day in weather historyWarnings in Idaho, May 1997
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: 5604363.