Right now
The most recent data we hold from NOAA arrived 15 minutes ago, and this point is in it.
2 other detections within 20 km in the last 24 hours, the nearest 18 km from here.
This alert expired on 8 September 2026 at 05:30 UTC. It is kept here as a record.
It is the 5th strongest of the 40 detections recorded within 20 km of this point since 13 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 7 at 11:42PM CDT until September 8 at 12:30AM CDT by NWS Sioux Falls SD
Nearby, since 13 April 2026
- May 17, 2026 · score 46 · 10.6 km
- June 28, 2026 · score 34 · 17.4 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 71% |
| Coordinates | 43.2444, -97.6866 |
| Nearest City | Mitchell (59 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-08T04:42:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.adb3c4438bc2f85d9747324333683b6629244eef.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lyon, IA; Sioux, IA; Lincoln, SD; Minnehaha, SD; Charles Mix, SD; Douglas, SD; Douglas, SD; Hutchinson, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 7 at 11:42PM CDT until September 8 at 12:30AM CDT by NWS Sioux Falls SD |
| Expires | 2026-09-08T00:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.adb3c4438bc2f85d9747324333683b6629244eef.001.1","noaa_urn:oid:2.49.0.1.840.0.81b4b5373659993570779b5cd5f02bc201551516.001.1","noaa_urn:oid:2.49.0.1.840.0.68aad3490d621d1668056838a1f01421607143c9.001.1","noaa_urn:oid:2.49.0.1.840.0.b5ab20fa066e85ea688229e5103028483a91ed6b.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 125 |
| Spc Location | 2 N Lake Andes |
| Spc County | Charles Mix |
| Spc State | SD |
| Spc Comments | (FSD) |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | 5 ESE Tyndall |
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 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.