Alert archive / South Dakota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 236, NWS Aberdeen, SD

August 16, 20255 counties in South Dakota; Big Stone County, Minnesota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 16, 2025, 4:30 AM CDT for 5 counties in South Dakota; Big Stone County, Minnesota. It was in force for 60 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: Aug 16, 2025, 4:30 AM CDT (09:30 UTC)
Expired: Aug 16, 2025, 5:30 AM CDT
In force: 60 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Big Stone County, MN, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 119 km from the middle of the area, began a volume at 09:32 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
Aug 15, 11:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 9.5 hours before the alert went out and 121 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: 1951 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 944 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.9

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 Aug 16, 2:06 AM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Aug 16, 2:06 AM CDT, 2 hours 24 minutes before

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Hazardous weather outlook, Aug 16, 3:56 AM CDT, 34 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
356 AM CDT Sat Aug 16 2025

SDZ003>006-009>011-015>020-022-033>037-045-048-051-170900-
Corson-Campbell-McPherson-Brown-Walworth-Edmunds-Day-Dewey-Potter-
Faulk-Spink-Clark-Codington-Hamlin-Stanley-Sully-Hughes-Hyde-Hand-
Jones-Lyman-Buffalo-
356 AM CDT Sat Aug 16 2025 /256 AM MDT Sat Aug 16 2025/

This Hazardous Weather Outlook is for central South Dakota, north
central South Dakota and northeast South Dakota.

.DAY ONE...Today and tonight.

There is a slight risk, or level 2 out of 5, for severe storms this
evening and into the overnight hours. These storms could have
damaging winds up to and in excessive of 60 mph as well as large
hail of an inch or greater in diameter. Locally heavy rainfall is
also a threat.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A marginal risk, or level 1 out of 5, is in place for severe storms
Saturday and again Sunday. Main threats will be damaging winds to
around 60 mph and large hail to around 1 inch in diameter.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested. Weather spotters are encouraged
to submit reports to the National Weather Service in Aberdeen. The
public can submit reports on our web page, Facebook page, or our X
feed.

MNZ039-046-SDZ007-008-021-023-170900-
Traverse-Big Stone-Marshall-Roberts-Grant-Deuel-
356 AM CDT Sat Aug 16 2025

This Hazardous Weather Outlook is for west central Minnesota and
northeast South Dakota.

.DAY ONE...Today and tonight.

There is a marginal risk, or level 1 out of 5, for severe storms
this evening and into the overnight hours. These storms could have
damaging winds up to and in excessive of 60 mph as well as large
hail of an inch or greater in diameter. Locally heavy rainfall is
also a threat.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A marginal risk, or level 1 out of 5, is in place for severe storms
Saturday and again Sunday. Main threats will be damaging winds to
around 60 mph and large hail to around 1 inch in diameter.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested. Weather spotters are encouraged
to submit reports to the National Weather Service in Aberdeen. The
public can submit reports on our web page, Facebook page, or our X
feed.

In the hours before

Special weather statement, Aug 16, 2:25 AM CDT, 2 hours 5 minutes before

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Special weather statement, Aug 16, 2:42 AM CDT, 1 hour 48 minutes before

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Special weather statement, Aug 16, 3:26 AM CDT, 1 hour 4 minutes before

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Local storm report, Aug 16, 4:14 AM CDT, 16 minutes before

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Local storm report, Aug 16, 4:26 AM CDT, 4 minutes before

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Local storm report, Aug 16, 4:28 AM CDT, 2 minutes 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
Aug 16, 12:04 AM CDT	Special Weather Statement	ABR	Jones	26 min
Aug 16, 12:15 AM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman, Stanley	60 min
Aug 16, 12:55 AM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Jones, Lyman	65 min
Aug 16, 1:51 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Buffalo, Lyman	69 min
Aug 16, 2:25 AM CDT	Special Weather Statement	ABR	Campbell	35 min
Aug 16, 2:33 AM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	44 min
Aug 16, 2:42 AM CDT	Special Weather Statement	ABR	Hand	33 min
Aug 16, 2:55 AM CDT	Areal Flood Warning	ABR	Buffalo, Lyman	10 hr
Aug 16, 3:08 AM CDT	Severe Thunderstorm Warning	ABR	Hamlin	67 min
Aug 16, 3:26 AM CDT	Special Weather Statement	ABR	Deuel	34 min
Aug 16, 3:39 AM CDT	Severe Thunderstorm Warning	ABR	Deuel	51 min
Aug 16, 3:57 AM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Deuel, Hamlin	48 min
Aug 16, 5:14 AM CDT	Special Weather Statement	ABR	Brown	31 min
Aug 16, 5:37 AM CDT	Special Weather Statement	ABR	Day	23 min
Aug 16, 5:53 AM CDT	Special Weather Statement	ABR	Day	37 min
Aug 16, 5:54 AM CDT	Special Weather Statement	ABR	Day	36 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2025 Severe Thunderstorm Warnings in Minnesota, 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.