This alert expired on 31 August 2026 at 02:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 55 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 30 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 8:59PM CDT until August 30 at 9:15PM CDT by NWS Aberdeen SD
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 66 % 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 | 66% |
| Coordinates | 45.7317, -99.4483 |
| Nearest City | Aberdeen (80 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-31T01:59:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Edmunds, SD; McPherson, SD |
| Headline | Severe Thunderstorm Warning issued August 30 at 8:59PM CDT until August 30 at 9:15PM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T21:15:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 3 NE Mobridge Municipal |
| Spc County | Walworth |
| Spc State | SD |
| Spc Comments | Spotter estimated 50-60 mph gusts. (ABR) |
| MergedSources | [{"id":"spc_wind_45.57_-100.37_99","source":"spc","severity":"medium","severityValue":45,"timestamp":1788139140000,"latitude":45.57,"longitude":-100.37}] |
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.