Alert archive / Iowa / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 143, NWS Sioux Falls, SD

June 30, 20264 counties in Iowa; Jackson County, Nobles County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 30, 2026, 2:21 AM CDT for 4 counties in Iowa; Jackson County, Nobles County, Minnesota. It was in force for 54 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 30, 2026, 2:21 AM CDT (07:21 UTC)
Expired: Jun 30, 2026, 3:15 AM CDT
In force: 54 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 109 km from the middle of the area, began a volume at 07:20 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 29, 11:55 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

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 30, 12:19 AM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jun 30, 12:19 AM CDT, 2 hours 2 minutes before

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Hazardous weather outlook, Jun 29, 7:17 PM CDT, 7 hours 4 minutes before

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In the hours before

Local storm report, Jun 29, 10:38 PM CDT, 3 hours 43 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1038 PM CDT Mon Jun 29 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1025 PM     Tstm Wnd Gst     3 W Dovray              44.06N 95.60W
06/29/2026  M51 MPH          Murray             MN   Mesonet

            Mesonet station MN038 T.h.30 - Dovray - Mp
            49.

&&

ak

Local storm report, Jun 30, 1:43 AM CDT, 38 minutes before

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Local storm report, Jun 30, 2:11 AM CDT, 10 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
211 AM CDT Tue Jun 30 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0153 AM     Tstm Wnd Gst     3 ESE Parker            43.37N 97.08W
06/30/2026  M56 MPH          Turner             SD   Mesonet

            Mesonet station 310 SD RWIS Parker.

0155 AM     Tstm Wnd Gst     1 NE Maurice            42.98N 96.17W
06/30/2026  M56 MPH          Sioux              IA   AWOS

            AWOS station KSXK 1 NE Maurice.

&&

Local storm report, Jun 30, 2:14 AM CDT, 7 minutes before

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Local storm report, Jun 30, 2:17 AM CDT, 4 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
217 AM CDT Tue Jun 30 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0151 AM     Tstm Wnd Gst     Sioux Center            43.08N 96.17W
06/30/2026  M57 MPH          Sioux              IA   Public

            Davis Personal Weather Station.

&&

JH

Local storm report, Jun 30, 2:20 AM CDT, 1 minute before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
220 AM CDT Tue Jun 30 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0217 AM     Tstm Wnd Gst     3 ENE Melvin            43.30N 95.55W
06/30/2026  E67 MPH          Osceola            IA   Public

            Davis Personal Weather Station.

&&

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	28 min
Jun 30, 12:43 AM CDT	Severe Thunderstorm Warning	FSD	Union	19 min
Jun 30, 1:14 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Clay, Union	46 min
Jun 30, 1:34 AM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	26 min
Jun 30, 1:54 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux	51 min
Jun 30, 4:37 AM CDT	Flash Flood Warning	FSD	Woodbury	2 hr
Jun 30, 2:43 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles	62 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2026 Severe Thunderstorm Warnings in Minnesota, 2026 Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.