This alert expired on 30 August 2026 at 05:00 UTC. It is kept here as a record.
It is the 10th strongest of the 20 detections recorded within 20 km of this point since 4 April 2026. The last comparable one was on 12 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 29 at 11:14PM CDT until August 30 at 12:00AM CDT by NWS Aberdeen SD
Nearby, since 4 April 2026
- June 19, 2026 · score 22 · 21.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 62 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 62% |
| Coordinates | 44.9943, -101.0129 |
| Nearest City | Bismarck (203 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T04:14:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dewey, SD |
| Headline | Severe Thunderstorm Warning issued August 29 at 11:14PM CDT until August 30 at 12:00AM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T00:00:00-05:00 |
| SenderName | NWS Aberdeen 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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 16/100, near Bismarck (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.