Right now
The most recent data we hold from NOAA arrived 2 hours 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 31 May 2026 at 22:45 UTC. It is kept here as a record.
It is the 7th strongest of the 19 detections recorded within 20 km of this point since 15 March 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 May 31 at 5:15PM CDT until May 31 at 5:45PM CDT by NWS Sioux Falls SD
An estimated 15,669 people live within 50 km of this point.
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 89 % 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 | 89% |
| Coordinates | 44.0400, -97.6650 |
| Nearest City | Mitchell (47 km) |
| Population Exposed | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T22:15:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.844f8f5f277be58944a33bb67d317015d856e93f.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Miner, SD |
| Headline | Severe Thunderstorm Warning issued May 31 at 5:15PM CDT until May 31 at 5:45PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-31T17:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 0.88 |
| Iem Unit | Inch |
| Iem City | 2 NNW Emery |
| Iem County | Hanson |
| Iem State | SD |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_44.010_-97.630_1780265220000","source":"iem","severity":"low","severityValue":25,"timestamp":1780265220000,"latitude":44.01,"longitude":-97.63},{"id":"iem_H_43.630_-97.640_1780263300000","source":"iem","severity":"low","severityValue":25,"timestamp":1780263300000,"latitude":43.63,"longitude":-97.64}] |
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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