South Dakota, 2026Flash Flood in South Dakota, May 31, 2026
May 31, 2026 · NWS FSD · 1 event in 1 county or zone
A slow moving and persistent thunderstorm brought as much as 1 to 3 inches of rain in a short period of time to a small portion of Minnehaha County. This resulted in the flooding and subsequent closure of Hwy 38 between Hartford and Humboldt.
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- 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.
A slow moving and persistent thunderstorm brought as much as 1 to 3 inches of rain in a short period of time to a small portion of Minnehaha County. This resulted in the flooding and subsequent closure of Hwy 38 between Hartford and Humboldt.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at May 31, 12:12 AM CST, 2 hours 56 minutes earlier.
Area forecast discussion, May 31, 12:12 AM CST, 2 hours 56 minutes before
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</html>Hazardous weather outlook, May 31, 2:55 AM CST, 13 minutes before
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</html>Flash Flood, Minnehaha
- When
- May 31, 3:08 AM CST to 4:08 AM CST
- Where
- Minnehaha County, 2.11 mi ESE of Humboldt to 2.29 mi ESE of Humboldt
- Cause
- Heavy Rain
- Reported by
- 911 Call Center
- Coordinates
- 43.643, -97.029
A small portion of Hwy 38 between Hartford and Humboldt (between 459th and 460th Ave) was impassable due to water over the road. Water was 3-4 feet deep in a couple of spots, but appeared to be slowly receding. Deputies had requested DOT barricades to close that section of road until the water fully receded.
- 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.
- Flood in Ohio, May 31, 20261 death · 1 event
- Heat in Arizona, May 31, 20261 death · 1 event
- Damaging Winds in Alabama, May 31, 2026$52,000 · 56 kt wind · 14 events
- Tornadoes and Flash Flood in South Dakota, May 31, 2026EF1 · 24 events
- Flash Flooding and Hail in Texas, May 31, 20261 in hail · 9 events
- Flash Flood and Hail in South Dakota, May 31, 20261 in hail · 7 events
- Hail and Damaging Wind in Kansas, May 31, 20262.5 in hail · 7 events
- Flooding and Damaging Winds in Missouri, May 31, 202670 kt wind · 4 events
- Tornado and Hail in Kansas, May 31, 20261.75 in hail · 4 events
- Hail and Damaging Wind in Iowa, May 31, 20261.5 in hail · 3 events
- Damaging Winds in Georgia, May 31, 202650 kt wind · 2 events
- Marine Thunderstorm Winds in South Atlantic Coastal Waters, May 31, 20262 events
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: 1328495.