Alert archive / South Dakota / Mesoscale Discussions in 2026

Mesoscale Discussion 975

June 3, 202610 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2026, 8:09 PM CDT for 10 counties in South Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 3, 2026, 8:09 PM CDT (01:09 UTC)
Expired: Jun 3, 2026, 9:45 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 271

Counties Aurora County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Jerauld County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 145 km from the middle of the area, began a volume at 01:11 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, 1.2 hours before the alert went out and 144 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: 966 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1215 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 3, 8:37 PM CDT	Mesoscale Discussion	SPC	Brookings, Codington, Deuel, Grant, Hamlin, Kingsbury and 1 more	83 min
Jun 4, 1:26 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Clark, Codington and 11 more	94 min
Jun 4, 2:32 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 3 more	88 min
Jun 4, 3:04 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	7 hr
Jun 4, 3:12 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brookings, Brule, Buffalo, Charles Mix and 21 more	93 min
Jun 4, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brookings, Brule, Buffalo, Charles Mix and 27 more	8 hr
Jun 4, 5:46 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Harding, Lawrence, Meade, Pennington and 1 more	89 min

Nearby

Mesoscale Discussions in South Dakota, 2026 Every mesoscale discussion 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.