This alert expired on 30 August 2026 at 05:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 17 detections recorded within 20 km of this point since 8 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 29 at 11:45PM CDT until August 30 at 12:45AM CDT by NWS Aberdeen SD
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Our confidence | 62% |
| Coordinates | 44.9420, -100.5700 |
| Nearest City | Aberdeen (173 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T04:45:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dewey, SD; Potter, SD; Sully, SD |
| Headline | Severe Thunderstorm Warning issued August 29 at 11:45PM CDT until August 30 at 12:45AM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T00:45:00-05:00 |
| 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 22/100, near Aberdeen (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.