This alert expired on 28 June 2026 at 09:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 25 detections recorded within 20 km of this point since 13 April 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 28 at 3:34AM CDT until June 28 at 4:00AM CDT by NWS Sioux Falls SD
An estimated 15,669 people live within 50 km of this point.
Nearby, since 13 April 2026
- May 17, 2026 · score 46 · 21.6 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 91% |
| Coordinates | 43.3110, -97.8810 |
| Nearest City | Mitchell (46 km) |
| Population Exposed | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T08:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3be467492c5f0f6e8b1bade15b76468c2a4b4508.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Bon Homme, SD; Hanson, SD; Hutchinson, SD; McCook, SD; Turner, SD; Yankton, SD |
| Headline | Severe Thunderstorm Warning issued June 28 at 3:34AM CDT until June 28 at 4:00AM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-28T04:00:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 65 |
| Iem Unit | MPH |
| Iem City | 4 NE Dante |
| Iem County | Charles Mix |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | Mesonet station 324 SD RWIS WAGNER. |
| MergedSources | [{"id":"iem_G_43.080_-98.280_1782631500000","source":"iem","severity":"low","severityValue":25,"timestamp":1782631500000,"latitude":43.08,"longitude":-98.28},{"id":"iem_G_43.050_-98.570_1782629460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782629460000,"latitude":43.05,"longitude":-98.57},{"id":"iem_G_43.380_-98.410_1782633060000","source":"iem","severity":"low","severityValue":25,"timestamp":1782633060000,"latitude":43.38,"longitude":-98.41},{"id":"iem_G_43.080_-98.130_1782632100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782632100000,"latitude":43.08,"longitude":-98.13}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.