Flash Flood, Treasure
- When
- April 9, 12:45 PM MST to 2:00 PM MST
- Where
- Treasure County, Sanders
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.212, -107.272 (the zone’s center; the record gives no point)
Flash Flooding and Hail in Montana, April 9, 1999
2 flash flood, 2 hail, as filed by the National Weather Service.
Where it happened
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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 radar
The Billings radar (KBLX), 110 km away, was scanning. The volume nearest the first event began at 19:42 UTC.
Event by event
2 flash flood, 2 hail. Local standard time, as filed.
Hail, Treasure
- When
- April 9, 12:45 PM MST to 1:00 PM MST
- Where
- Treasure County, Sanders
- Measured
- 0.88 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.280, -107.100
A spotter in Sanders (7NE Hysham) reported nickel to dime sized hail as well as flash flooding along Starve to Death Creek as a thunderstorm moved slowly northeast over the area.
Flash Flood, Rosebud
- When
- April 9, 1:00 PM MST to 3:00 PM MST
- Where
- Rosebud County, 5 mi E of Vananda
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.230, -106.731 (the zone’s center; the record gives no point)
Hail, Rosebud
- When
- April 9, 1:30 PM MST to 3:00 PM MST
- Where
- Rosebud County, 5 mi E of Vananda
- Measured
- 0.75 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 46.380, -106.900
A spotter 5E Vananda in northwestern Rosebud County reported dime sized hail accumulating between 15 and 20 inches from a slow moving thunderstorm. The storm also produced flash flooding in parts of northwestern Rosebud County.
What these are
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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 Montana in 1999Every state in 1999This day in weather historyWarnings in Montana, 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: 5696231, 5696232, 5696233, 5696234.