This alert expired on 27 June 2026 at 05:37 UTC. It is kept here as a record.
No stronger detection stands among the 13 recorded within 20 km of this point since 4 April 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 12:27AM CDT until June 27 at 12:30AM CDT by NWS Aberdeen SD
Nearby, since 4 April 2026
- June 2, 2026 · score 22 · 12.3 km
How we know
Confirmed by 3 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 | 44.4855, -100.6782 |
| Nearest City | Aberdeen (203 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-27T05:27:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Stanley, SD |
| Headline | Severe Thunderstorm Warning issued June 27 at 12:27AM CDT until June 27 at 12:30AM CDT by NWS Aberdeen SD |
| Expires | 2026-06-27T00:37:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 52 |
| Iem Unit | mph |
| Iem City | 10 NNW Ottumwa |
| Iem County | Haakon |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_44.710_-101.370_1782534300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782534300000,"latitude":44.71,"longitude":-101.37},{"id":"iem_G_44.360_-101.450_1782533880000","source":"iem","severity":"low","severityValue":25,"timestamp":1782533880000,"latitude":44.36,"longitude":-101.45}] |
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.