Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is in it.
5 other detections within 20 km in the last 24 hours, the nearest 5 km from here.
This alert expired on 8 September 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 167 recorded within 20 km of this point since 17 May 2026 — 86 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 7 at 6:34PM CDT until September 7 at 7:00PM CDT by NWS Sioux Falls SD
Nearby, since 17 May 2026
- September 1, 2026 · score 28 · 16.6 km
- September 8, 2026 · score 28 · 16.9 km
- September 7, 2026 · score 28 · 16.9 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 70 % 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 | 70% |
| Coordinates | 43.0220, -98.7780 |
| Nearest City | Mitchell (98 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-07T23:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.3470a53b8f1518f5eb8565cba4a2cd25c4a9de2d.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Charles Mix, SD; Gregory, SD; Boyd, NE; Holt, NE |
| Headline | Severe Thunderstorm Warning issued September 7 at 6:34PM CDT until September 7 at 7:00PM CDT by NWS Sioux Falls SD |
| Expires | 2026-09-07T19:00:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3470a53b8f1518f5eb8565cba4a2cd25c4a9de2d.001.1","noaa_urn:oid:2.49.0.1.840.0.7a798844068cb5614ef6079082aa107d0f2dc4fb.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 6 WSW Butte |
| Spc County | Holt |
| Spc State | NE |
| Spc Comments | mostly peas but a couple of quarters. Time estimated from radar. (LBF) |
| Iem TypeSummary | G |
| Iem Magnitude | 71 |
| Iem Unit | MPH |
| Iem City | 6 W Butte |
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.