Flash Flood, Dewey
- When
- May 3, 7:30 PM CST to 9:30 PM CST
- Where
- Dewey County, 15 mi S of La Plant
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 45.157, -100.872 (the zone’s center; the record gives no point)
Flash Flood in South Dakota, May 3, 1999
Two to four inches of rain fell across southeast Dewey county causing flash flooding south of La Plant mainly on Willow Creek. As a result of the flash flooding, several roads were underwater.
Where it happened
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.
- 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
- 1
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 ABR wrote it up.
Two to four inches of rain fell across southeast Dewey county causing flash flooding south of La Plant mainly on Willow Creek. As a result of the flash flooding, several roads were underwater. Highway 212 just south of La Plant was flooded for a few hours along with Highway 8, 15 miles south of La Plant. The flash flooding resulted in some road and bridge damage.
The radar
The Bismarck radar (KBIS), 180 km away, was scanning. The volume nearest the first event began at 01:27 UTC.
Event by event
1 flash flood. Local standard time, as filed.
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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Oklahoma, May 3, 1999
- Tornadoes and Flash Flooding in Kansas, May 3 to 12, 1999
- Tornadoes and Flash Flooding in Oklahoma, May 3 to 4, 1999
- Tornado and Hail in Nebraska, May 3, 1999
- Tornadoes and Hail in Texas, May 3 to 4, 1999
- High Wind in California, May 3, 1999
- Tornado in Nebraska, May 3, 1999
- Hail and Damaging Winds in Kansas, May 3, 1999
- High Wind in Nevada, May 3, 1999
- Hail and Damaging Winds in Texas, May 3, 1999
- Wildfire in Florida, May 3, 1999
- Tornado in Nebraska, May 3, 1999
More
Every storm in South Dakota in 1999Every state in 1999This day in weather historyWarnings in South Dakota, May 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: 5699962.