This alert expired on 31 August 2026 at 01:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 27 detections recorded within 20 km of this point since 2 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 8:22PM CDT until August 30 at 8:45PM CDT by NWS Aberdeen SD
Nearby, since 2 April 2026
- June 3, 2026 · score 22 · 8.6 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % 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 | 71% |
| Coordinates | 45.5058, -100.2600 |
| Nearest City | Aberdeen (138 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-31T01:22:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Campbell, SD; Corson, SD; Dewey, SD; Walworth, SD |
| Headline | Severe Thunderstorm Warning issued August 30 at 8:22PM CDT until August 30 at 8:45PM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T20:45:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 4 W Trail City |
| Spc County | Corson |
| Spc State | SD |
| Spc Comments | Mesonet station 178 Trail City (SDDOT). (ABR) |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | 4 W Trail City |
| Iem County | Corson |
| Iem State | SD |
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.