Flood, Codington
- When
- April 20, 4:15 AM CST to April 30, 11:59 PM CST
- Where
- Codington County, 8.75 mi NE of Florence to 2.81 mi NE of Florence
- Cause
- Heavy Rain / Snow Melt
- Reported by
- River/Stream Gage
- Coordinates
- 45.150, -97.210
Flood in South Dakota, April 20 to 30, 2018
Snow melt water from the mid-April snowstorm brought the Big Sioux River in Codington county above flood stage on April 20th. The river rose above the 8 foot flood stage near Watertown to nearly 10 feet on April 22nd.
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.
Snow melt water from the mid-April snowstorm brought the Big Sioux River in Codington county above flood stage on April 20th. The river rose above the 8 foot flood stage near Watertown to nearly 10 feet on April 22nd. The flooding continued into early May. Some agricultural land was flooded as a result.
What forecasters said that day
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Aberdeen, SD wrote its last area forecast discussion before the first event at Apr 20, 2:18 AM CST, 1 hour 57 minutes earlier.
Area forecast discussion, Apr 20, 2:18 AM CST, 1 hour 57 minutes before
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</html>Hazardous weather outlook, Apr 20, 2:09 AM CST, 2 hours 6 minutes before
Hazardous Weather Outlook National Weather Service Aberdeen SD 309 AM CDT Fri Apr 20 2018 MNZ039-046-SDZ003>011-015>019-033>037-045-048-051-210815- Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall- Roberts-Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark- Stanley-Sully-Hughes-Hyde-Hand-Jones-Lyman-Buffalo- 309 AM CDT Fri Apr 20 2018 /209 AM MDT Fri Apr 20 2018/ This Hazardous Weather Outlook is for portions of west central Minnesota, central South Dakota, north central South Dakota, and northeast South Dakota. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. SDZ020>023-210815- Codington-Grant-Hamlin-Deuel- 309 AM CDT Fri Apr 20 2018 This Hazardous Weather Outlook is for portions of northeast South Dakota. .DAY ONE...Today and Tonight Minor river and creek flooding is occurring due to the snowmelt. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. Connelly
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
- Flooding in South Dakota, April 20 to 30, 2018
- Frost and Freeze in Virginia, April 20, 2018
- Flooding in Minnesota, April 20 to 26, 2018
- Frost and Freeze in Maryland, April 20, 2018
- Winter Storm in Wyoming, April 20 to 21, 2018
- Frost and Freeze in West Virginia, April 20, 2018
- Winter Weather in Utah, April 20, 2018
- Heavy Rain in Hawaii, April 20, 2018
- High Wind in New Mexico, April 20, 2018
- Flood in Kentucky, April 20 to 26, 2018
More
Every storm in South Dakota in 2018Every state in 2018This day in weather historyWarnings in South Dakota, April 2018
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: 752609.