Alert archive / Minnesota / Flood Watches in 2025
Flood Watch 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flood watch at Aug 17, 2025, 2:45 PM CDT for 4 counties in Minnesota. It took effect at Aug 17, 2025, 7:00 PM CDT. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2025, 2:45 PM CDT (19:45 UTC)
- In effect from
- Aug 17, 2025, 7:00 PM CDT
- Expired
- Aug 18, 2025, 6:04 AM CDT
- In force
- 11 hr
- Issued by
- NWS Sioux Falls, SD
- Flood severity
- None
Counties Cottonwood County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN
The radar
The Sioux Falls radar (KFSD), 104 km from the middle of the area, began a volume at 19:44 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 7.8 hours before the alert went out and 185 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 127 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 649 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
What forecasters said that day
The local office's own words before this flood watch went out, 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 this flood watch went out at Aug 17, 12:26 PM CDT, 2 hours 19 minutes earlier.
Area forecast discussion, Aug 17, 12:26 PM CDT, 2 hours 19 minutes before
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</html>Hazardous weather outlook, Aug 17, 4:35 AM CDT, 10 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 435 AM CDT Sun Aug 17 2025 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-180945- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory- Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook- Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton- Union- 435 AM CDT Sun Aug 17 2025 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Training thunderstorms over southwest Minnesota will result in localized flash flooding through early morning. Heat index values between 90 and 102 degrees are expected this afternoon with the highest values south of I-90. Isolated to scattered thunderstorms may develop again late this afternoon into tonight. A few of these storms could be severe with hail to the size of half dollars and wind gusts to 65 mph. .DAYS TWO THROUGH SEVEN...Monday through Saturday. A few storms are again possible Monday evening. Details remain uncertain but storms may be capable of producing large hail and damaging wind gusts. Please continue to monitor for forecast and thunderstorm risk changes. .SPOTTER INFORMATION STATEMENT... Spotter activation will be possible tonight.
In the hours before
Local storm report, Aug 17, 9:36 AM CDT, 5 hours 9 minutes before
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</html>Local storm report, Aug 17, 2:16 PM CDT, 29 minutes before
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</html>Local storm report, Aug 17, 2:18 PM CDT, 27 minutes before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:36 AM CDT | River Flood Warning | FSD | Brookings, Hamlin | 11 days |
| Aug 17, 2:07 AM CDT | Flash Flood Warning | FSD | Cottonwood, Lyon, Murray | 8 hr |
| Aug 17, 3:48 AM CDT | Flash Flood Warning | FSD | Lincoln, Lyon | 3 hr |
| Aug 17, 4:22 AM CDT | Flash Flood Warning | FSD | Lyon | 6 hr |
| Aug 17, 6:48 AM CDT | Flash Flood Warning | FSD | Cottonwood, Murray | 3 hr |
| Aug 17, 10:03 AM CDT | Areal Flood Warning | FSD | Cottonwood, Lyon, Murray | 5 hr |
| Aug 17, 10:03 AM CDT | Areal Flood Warning | FSD | Lincoln, Lyon | 5 hr |
| Aug 17, 10:03 AM CDT | Areal Flood Warning | FSD | Cottonwood, Murray | 5 hr |
Nearby
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.