Alert archive / Iowa / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 124, NWS Sioux Falls, SD

June 29, 20256 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 29, 2025, 4:06 AM CDT for 6 counties in Iowa. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 29, 2025, 4:06 AM CDT (09:06 UTC)
Expired: Jun 29, 2025, 4:45 AM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, O'Brien County, IA, Plymouth County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 115 km from the middle of the area, began a volume at 09:09 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 28, 11:12 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 9.1 hours before the alert went out and 312 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2696 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 7.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 28, 3:19 PM CDT, 12 hours 47 minutes earlier.

Area forecast discussion, Jun 28, 3:19 PM CDT, 12 hours 47 minutes before

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Hazardous weather outlook, Jun 28, 4:18 AM CDT, 23 hours 48 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 10:30 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	60 min
Jun 28, 10:33 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	42 min
Jun 28, 10:53 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury	37 min
Jun 28, 11:26 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Moody	49 min
Jun 28, 11:31 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Miner	44 min
Jun 29, 12:14 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Brookings, Lake, Moody	46 min
Jun 29, 12:50 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Miner	25 min
Jun 29, 1:23 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Turner, Yankton	52 min
Jun 29, 1:57 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Turner, Yankton	33 min
Jun 29, 2:09 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Yankton	36 min
Jun 29, 2:42 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Union, Yankton	34 min
Jun 29, 6:07 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	23 min
Jun 29, 6:17 AM CDT	River Flood Warning	FSD	Brookings, Hamlin	6 days
Jun 29, 6:29 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Sanborn	31 min
Jun 29, 7:58 AM CDT	River Flood Warning	FSD	Brookings	21 days
Jun 29, 9:30 AM CDT	River Flood Warning	FSD	Brookings, Moody	11 days
Jun 29, 10:20 AM CDT	River Flood Warning	FSD	Brookings	60 hr
Jun 29, 3:38 AM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Plymouth, Sioux	37 min
Jun 29, 4:02 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	43 min
Jun 29, 4:42 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Ida, Plymouth, Woodbury	48 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2025 Every severe thunderstorm warning 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.