This alert expired on 25 May 2026 at 00:16 UTC. It is kept here as a record.
It is the 221st strongest of the 268 detections recorded within 20 km of this point since 17 May 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 24 at 7:06PM CDT until May 24 at 7:15PM CDT by NWS Sioux Falls SD
Nearby, since 17 May 2026
- May 24, 2026 · score 22 · 21.6 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 69 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 69% |
| Coordinates | 42.7705, -97.8550 |
| Nearest City | Norfolk (90 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-25T00:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e7ff722a0c8d493b00c66a91e8610eda |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McCook, SD; Minnehaha, SD; Antelope, NE; Bon Homme, SD; Hutchinson, SD; Yankton, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 24 at 7:06PM CDT until May 24 at 7:15PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-24T19:16:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e7ff722a0c8d493b00c66a91e8610edaca758631.001.1","noaa_urn:oid:2.49.0.1.840.0.eeaecafca42097a673580ba17ec640cd815085f1.001.1","noaa_urn:oid:2.49.0.1.840.0.e93e52cea84febae8aa6bc70d82a69ee610b3179.001.1","noaa_urn:oid:2.49.0.1.840.0.e0a9c9b760e3fc80b4eed94dfee9643a668d8de8.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | 6 NW Scotland |
| Iem County | Hutchinson |
| Iem State | SD |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_43.180_-98.070_1779660660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779660660000,"latitude":43.18,"longitude":-98.07},{"id":"iem_H_43.230_-97.970_1779661560000","source":"iem","severity":"low","severityValue":25,"timestamp":1779661560000,"latitude":43.23,"longitude":-97.97},{"id":"iem_H_43.240_-97.900_1779662400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779662400000,"latitude":43.24,"longitude":-97.9},{"id":"iem_H_43.220_-97.830_1779663300000","source":"iem","severity":"low","severityValue":25,"timestamp":1779663300000,"latitude":43.22,"longitude":-97.83},{"id":"iem_H_43.210_-97.780_1779663480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779663480000,"latitude":43.21,"longitude":-97.78}] |
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 8 March 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.