Alert archive / South Dakota / Flood Watches in 2025
Flood Watch 5, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flood watch at Aug 21, 2025, 3:34 PM CDT for Beadle County, Brookings County, Kingsbury County, South Dakota. It took effect at Aug 21, 2025, 7:00 PM CDT. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2025, 3:34 PM CDT (20:34 UTC)
- In effect from
- Aug 21, 2025, 7:00 PM CDT
- Expired
- Aug 22, 2025, 9:11 AM CDT
- In force
- 14 hr
- Issued by
- NWS Sioux Falls, SD
- Flood severity
- None
Counties Beadle County, SD, Brookings County, SD, Kingsbury County, SD
The radar
The Sioux Falls radar (KFSD), 109 km from the middle of the area, began a volume at 20:38 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
Aberdeen, SD (KABR), launched 12:00Z, 8.6 hours before the alert went out and 90 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
- 1155 J/kg
- Mixed-layer CIN
- -351 J/kg
- Mixed-layer LCL
- 1022 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
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 21, 12:38 PM CDT, 2 hours 56 minutes earlier.
Area forecast discussion, Aug 21, 12:38 PM CDT, 2 hours 56 minutes before
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</html>Hazardous weather outlook, Aug 21, 10:08 AM CDT, 5 hours 26 minutes before
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Flood Watches in South Dakota, 2025Every flood watch in 2025
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.