Alert archive / South Dakota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 155, NWS Aberdeen, SD

July 27, 2025Grant County, South Dakota; Big Stone County, Minnesota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 27, 2025, 11:49 AM CDT for Grant County, South Dakota; Big Stone County, Minnesota. It was in force for 41 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: Jul 27, 2025, 11:49 AM CDT (16:49 UTC)
Expired: Jul 27, 2025, 12:30 PM CDT
In force: 41 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Big Stone County, MN, Grant County, SD

The radar

The Aberdeen radar (KABR), 143 km from the middle of the area, began a volume at 16:50 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, 4.8 hours before the alert went out and 149 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: 1882 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1193 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jul 27, 8:47 AM CDT, 3 hours 2 minutes earlier.

Area forecast discussion, Jul 27, 8:47 AM CDT, 3 hours 2 minutes before

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Hazardous weather outlook, Jul 27, 3:29 AM CDT, 8 hours 20 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
Jul 26, 7:10 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Dewey, Stanley	65 min
Jul 26, 7:12 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Dewey	46 min
Jul 26, 7:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Corson, Dewey, Walworth	16 min
Jul 26, 8:11 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Dewey, Potter, Stanley, Sully	49 min
Jul 26, 8:21 PM CDT	Areal Flood Warning	ABR	Dewey	3 hr
Jul 26, 8:44 PM CDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Sully, Walworth	46 min
Jul 26, 9:25 PM CDT	Special Weather Statement	ABR	Potter	35 min
Jul 26, 9:58 PM CDT	Severe Thunderstorm Warning	ABR	Hand, Hyde, Spink	62 min
Jul 26, 10:15 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Hyde	45 min
Jul 26, 10:34 PM CDT	Severe Thunderstorm Warning	ABR	Hand	26 min
Jul 26, 11:26 PM CDT	Special Weather Statement	ABR	Brown	34 min
Jul 27, 2:26 AM CDT	Special Weather Statement	ABR	Corson	34 min
Jul 27, 2:01 PM CDT	Heat Advisory	ABR	Buffalo, Hand, Hughes, Hyde, Jones, Lyman and 1 more	29 hr
Jul 27, 4:25 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	50 min
Jul 27, 5:54 PM CDT	Tornado Warning	ABR	Codington	36 min
Jul 27, 6:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Codington, Deuel, Grant, Hamlin	41 min
Jul 27, 6:47 PM CDT	Tornado Warning	ABR	Codington, Hamlin	31 min
Jul 27, 3:58 PM CDT	Severe Thunderstorm Warning	ABR	Traverse	20 min
Jul 27, 4:11 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	19 min
Jul 27, 5:11 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone	22 min
Jul 27, 5:32 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	43 min
Jul 27, 6:12 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	48 min
Jul 27, 6:41 PM CDT	Areal Flood Warning	ABR	Big Stone, Traverse	6 hr
Jul 27, 6:54 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	51 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.