Right now
The most recent data we hold from NOAA arrived 28 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 24 May 2026 at 22:30 UTC. It is kept here as a record.
It is the 52nd strongest of the 126 detections recorded within 20 km of this point since 13 April 2026. The last comparable one was on 17 May 2026. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 24 at 4:39PM CDT until May 24 at 5:30PM CDT by NWS Sioux Falls SD
Nearby, since 13 April 2026
- June 28, 2026 · score 34 · 23.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 58 % 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) | 22 / 100 |
| Our confidence | 58% |
| Coordinates | 43.1760, -98.1040 |
| Nearest City | Mitchell (60 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-24T21:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3f170fa3dada8bb1e05f021abda41ac36d1ca1ab.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Bon Homme, SD; Charles Mix, SD; Douglas, SD; Hutchinson, SD |
| Headline | Severe Thunderstorm Warning issued May 24 at 4:39PM CDT until May 24 at 5:30PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-24T17:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
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.
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