Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
6 other detections within 20 km in the last 24 hours, the nearest 16 km from here.
This alert expired on 7 August 2026 at 10:30 UTC. It is kept here as a record.
It is the 7th strongest of the 21 detections recorded within 20 km of this point since 17 May 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 7 at 4:55AM CDT until August 7 at 5:30AM CDT by NWS Sioux Falls SD
An estimated 15,669 people live within 50 km of this point.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 81 % 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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 43.8216, -97.8521 |
| Nearest City | Mitchell (19 km) |
| Population Exposed | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-07T09:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.098f8f1df60494a52fbe2c8198b74dfa |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Miner, SD; Sanborn, SD; Davison, SD; Hanson, SD |
| Headline | Severe Thunderstorm Warning issued August 7 at 4:55AM CDT until August 7 at 5:30AM CDT by NWS Sioux Falls SD |
| Expires | 2026-08-07T05:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.098f8f1df60494a52fbe2c8198b74dfa7c296c4a.001.1","noaa_urn:oid:2.49.0.1.840.0.a9ddf4836365b3d30cc22e22557d12621b960ea5.001.1"] |
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 near Mitchell?
Calamity.live data shows a weather event with CalamityScore 28/100, near Mitchell (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.