Flood, Dewey
- When
- April 13, 7:00 AM MST to April 18, 7:00 AM MST
- Where
- Dewey County, 2.96 mi ESE of Whitehorse to 3.21 mi ESE of Whitehorse
- Cause
- Heavy Rain / Snow Melt
- Reported by
- River/Stream Gage
- Coordinates
- 45.256, -100.843
Flood in South Dakota, April 13 to 18, 2009
Additional snowmelt runoff caused the Moreau River at Whitehorse to rise above flood stage on April 13th. The Moreau rose above the flood stage of 21 feet to nearly 25 feet on April 17th before falling back below flood stage on April 18th.
Where it happened
Every event with a place to put it. 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.
Additional snowmelt runoff caused the Moreau River at Whitehorse to rise above flood stage on April 13th. The Moreau rose above the flood stage of 21 feet to nearly 25 feet on April 17th before falling back below flood stage on April 18th. Agricultural and pastureland along with a few roads were flooded.
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 flood. Local standard time, as filed.
What these are
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- High Wind and Strong Wind in Georgia, April 13, 2009
- High Wind and Strong Wind in Tennessee, April 13, 2009
- Rip Current in Florida, April 13, 2009
- Tornado and Flash Flood in Georgia, April 13, 2009
- Tornado and Hail in Georgia, April 13, 2009
- Tornado and Hail in Alabama, April 13, 2009
- Flooding and Hail in Florida, April 13, 2009
- Hail and Damaging Winds in Georgia, April 13 to 14, 2009
- Tornado and Hail in Florida, April 13 to 14, 2009
- Flash Flooding in Mississippi, April 13, 2009
- Tornado and Hail in Georgia, April 13, 2009
- Hail and Damaging Wind in Kentucky, April 13, 2009
More
Every storm in South Dakota in 2009Every state in 2009This day in weather historyWarnings in South Dakota, April 2009
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 2026-10-01. Each event’s entry at NCEI: 165310.