Alert archive / South Dakota / Flash Flood Warnings
Flash Flood Warnings in South Dakota, 2024
40 flash flood warnings in 2024. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Flash Flood Warnings
- 40
- Busiest month
- June27 flash flood warnings
- Busiest day
- June 21, 202415 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
27 of 40 flash flood warnings covering South Dakota in 2024 had a flash flood report inside them; 33 of 39 flash flood reports fell inside a warning, on average 83 minutes after it went out.
South Dakota, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 40 | 27 | 32% | 39 | 85% | 83 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Aberdeen, SD: flash flood warnings | 14 | 7 | 50% | 9 | 78% | 33 min |
| NWS Sioux Falls, SD: flash flood warnings | 34 | 29 | 15% | 54 | 89% | 90 min |
| NWS Rapid City, SD: flash flood warnings | 3 | 1 | 67% | 1 | 100% | 46 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 2:03 PM CDT | Flash Flood Warning | FSD | Lincoln | 100 min |
| Jun 2, 7:07 PM CDT | Flash Flood Warning | ABR | Clark | 6 hr |
| Jun 2, 7:59 PM CDT | Flash Flood Warning | ABR | Hand | 6 hr |
| Jun 2, 8:02 PM CDT | Flash Flood Warning | ABR | Clark | 6 hr |
| Jun 2, 8:04 PM CDT | Flash Flood Warning | ABR | Hamlin | 6 hr |
| Jun 16, 11:48 PM CDT | Flash Flood Warning | FSD | Charles Mix, Gregory | 6 hr |
| Jun 17, 4:54 AM CDT | Flash Flood Warning | FSD | Clay, Union | 6 hr |
| Jun 18, 2:12 AM CDT | Flash Flood Warning | ABR | Stanley | 4 hr |
| Jun 20, 3:44 PM CDT | Flash Flood Warning | FSD | Hutchinson, Lincoln, Turner | 3 hr |
| Jun 20, 8:28 PM CDT | Flash Flood Warning | ABR | Lyman | 6 hr |
| Jun 20, 8:29 PM CDT | Flash Flood Warning | FSD | Brule | 3 hr |
| Jun 20, 8:33 PM CDT | Flash Flood Warning | ABR | Buffalo, Hand | 6 hr |
| Jun 20, 8:46 PM CDT | Flash Flood Warning | UNR | Mellette, Tripp | 6 hr |
| Jun 20, 9:06 PM CDT | Flash Flood Warning | FSD | Aurora, Brule, Davison | 3 hr |
| Jun 20, 10:01 PM CDT | Flash Flood Warning | UNR | Todd, Tripp | 4 hr |
| Jun 20, 10:14 PM CDT | Flash Flood Warning | FSD | Davison, Hanson | 11 hr |
| Jun 20, 11:01 PM CDT | Flash Flood Warning | FSD | Hanson, Lake, McCook, Miner, Minnehaha | 9 hr |
| Jun 21, 12:10 AM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha, Turner | 9 hr |
| Jun 21, 12:22 AM CDT | Flash Flood Warning | FSD | Hutchinson, Lincoln, Turner | 9 hr |
| Jun 21, 12:30 AM CDT | Flash Flood Warning | FSD | Aurora, Brule, Davison | 8 hr |
| Jun 21, 1:11 AM CDT | Flash Flood Warning | FSD | Minnehaha | 8 hr |
| Jun 21, 2:29 AM CDT | Flash Flood Warning | FSD | Clay, Lincoln, Turner, Union, Yankton | 7 hr |
| Jun 21, 5:48 PM CDT | Flash Flood Warning | FSD | Davison, Hanson, Lake, McCook, Miner, Moody and 1 more | 3 hr |
| Jun 21, 6:27 PM CDT | Flash Flood Warning | FSD | Brookings, Moody | 4 hr |
| Jun 21, 7:32 PM CDT | Flash Flood Warning | FSD | Aurora, Brule, Charles Mix, Davison, Douglas, Gregory and 2 more | 3 hr |
| Jun 21, 7:33 PM CDT | Flash Flood Warning | FSD | Bon Homme, Clay, Hutchinson, Lincoln, McCook, Minnehaha and 2 more | 4 hr |
| Jun 21, 7:57 PM CDT | Flash Flood Warning | FSD | Clay, Lincoln, Minnehaha, Turner, Yankton | 4 hr |
| Jun 28, 12:10 AM CDT | Flash Flood Warning | ABR | Stanley | 4 hr |
| Jul 19, 10:37 AM CDT | Flash Flood Warning | FSD | Yankton | 3 hr |
| Jul 19, 11:52 AM CDT | Flash Flood Warning | FSD | Hutchinson, Turner, Yankton | 2 hr |
| Jul 31, 8:39 PM CDT | Flash Flood Warning | FSD | Brookings, Kingsbury, Lake, Moody | 3 hr |
| Aug 19, 10:44 PM CDT | Flash Flood Warning | UNR | Lawrence | 2 hr |
| Aug 20, 2:30 AM CDT | Flash Flood Warning | ABR | Hughes, Stanley | 3 hr |
| Aug 21, 8:32 PM CDT | Flash Flood Warning | ABR | Jones, Stanley | 6 hr |
| Aug 21, 9:47 PM CDT | Flash Flood Warning | ABR | Jones, Stanley | 5 hr |
| Aug 21, 10:17 PM CDT | Flash Flood Warning | ABR | Hughes, Stanley | 6 hr |
| Aug 21, 11:09 PM CDT | Flash Flood Warning | ABR | Jones, Lyman | 6 hr |
| Aug 21, 11:24 PM CDT | Flash Flood Warning | ABR | Hughes, Hyde | 6 hr |
| Aug 25, 8:09 PM CDT | Flash Flood Warning | FSD | Charles Mix | 92 min |
| Aug 25, 8:15 PM CDT | Flash Flood Warning | FSD | Charles Mix | 86 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lincoln County7
- Turner County7
- Stanley County6
- Hutchinson County5
- Davison County5
- Minnehaha County5
- Yankton County5
- Charles Mix County4
- Clay County4
- Brule County4
- Hanson County4
- Aurora County3
- Lake County3
- McCook County3
- Moody County3
- Hughes County3
- Jones County3
- Clark County2
- Hand County2
- Gregory County2
- Union County2
- Lyman County2
- Tripp County2
- Miner County2
- Brookings County2
- Hamlin County1
- Buffalo County1
- Mellette County1
- Todd County1
- Sanborn County1
- Douglas County1
- Bon Homme County1
- Kingsbury County1
- Lawrence County1
- Hyde County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.