Alert archive / South Dakota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 46, NWS Aberdeen, SD

June 20, 20254 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jun 20, 2025, 10:16 PM CDT for 4 counties in South Dakota. It was in force for 44 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 20, 2025, 10:16 PM CDT (03:16 UTC)
Expired: Jun 20, 2025, 11:00 PM CDT
In force: 44 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Campbell County, SD, Edmunds County, SD, McPherson County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 96 km from the middle of the area, began a volume at 03:15 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 20, 7:54 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.3 hours before the alert went out and 124 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: 3967 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1904 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 350 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 23.3

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 6:11 PM CDT, 4 hours 5 minutes earlier.

Area forecast discussion, Jun 20, 6:11 PM CDT, 4 hours 5 minutes before

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Hazardous weather outlook, Jun 20, 4:02 PM CDT, 6 hours 14 minutes before

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In the hours before

Local storm report, Jun 20, 5:15 PM CDT, 5 hours 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Corson, Dewey	73 min
Jun 20, 9:31 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson	19 min
Jun 20, 11:03 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	42 min
Jun 20, 11:07 PM CDT	Special Weather Statement	ABR	Edmunds	23 min
Jun 21, 2:08 PM CDT	Heat Advisory	ABR	Brown, Clark, Codington, Day, Deuel, Grant and 4 more	29 hr

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.