Alert archive / South Dakota / Red Flag Warnings in 2026

Red Flag Warning 10, NWS Aberdeen, SD

April 23, 20268 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this red flag warning at Apr 23, 2026, 2:00 AM CDT for 8 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Apr 23, 2026, 1:00 PM CDT. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 23, 2026, 2:00 AM CDT (07:00 UTC)
In effect from: Apr 23, 2026, 1:00 PM CDT
Expired: Apr 23, 2026, 7:00 PM CDT
In force: 6 hr
Issued by: NWS Aberdeen, SD

Counties Big Stone County, MN, Traverse County, MN, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 109 km from the middle of the area, began a volume at 07:00 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 00:00Z, 7.0 hours before the alert went out and 112 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: 259 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 3629 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 7:02 PM CDT	Special Weather Statement	ABR	Stanley	28 min
Apr 22, 7:49 PM CDT	Special Weather Statement	ABR	Dewey, Jones, Stanley	41 min
Apr 22, 8:27 PM CDT	Special Weather Statement	ABR	Dewey, Jones, Stanley	33 min
Apr 22, 8:42 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Stanley	48 min
Apr 22, 8:57 PM CDT	Special Weather Statement	ABR	Sully	33 min
Apr 22, 8:58 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Edmunds, Potter, Walworth	47 min
Apr 22, 9:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Campbell, Edmunds, McPherson, Walworth	53 min
Apr 22, 9:30 PM CDT	Special Weather Statement	ABR	Campbell, Hughes, Jones, Lyman, Potter, Sully and 1 more	45 min
Apr 22, 10:09 PM CDT	Special Weather Statement	ABR	McPherson	51 min
Apr 22, 10:44 PM CDT	Special Weather Statement	ABR	Edmunds	31 min
Apr 22, 10:54 PM CDT	Special Weather Statement	ABR	Sully	51 min
Apr 22, 10:57 PM CDT	Special Weather Statement	ABR	McPherson	33 min
Apr 22, 11:28 PM CDT	Special Weather Statement	ABR	Campbell, Edmunds, McPherson	47 min
Apr 22, 11:32 PM CDT	Special Weather Statement	ABR	Dewey, Potter, Sully	58 min
Apr 23, 1:00 AM CDT	Wind Advisory	ABR	Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 12 more	18 hr

Nearby

Red Flag Warnings in South Dakota, 2026 Red Flag Warnings in Minnesota, 2026 Every red flag 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.