Right now
The most recent data we hold from NOAA arrived 26 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 25 May 2026 at 01:45 UTC. It is kept here as a record.
It is the 24th strongest of the 75 detections recorded within 20 km of this point since 17 May 2026. The last comparable one was on 17 May 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 24 at 8:01PM CDT until May 24 at 8:45PM CDT by NWS Sioux Falls SD
An estimated 171,544 people live within 50 km of this point.
Nearby, since 17 May 2026
- September 8, 2026 · score 37 · 7.1 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 89 % 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) | 43 / 100 |
| Our confidence | 89% |
| Coordinates | 43.4152, -97.1551 |
| Nearest City | Sioux Falls (37 km) |
| Population Exposed | 171.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-25T01:01:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.436f55dcf855b9cfcb4b5a905b15f63f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hutchinson, SD; Turner, SD; Yankton, SD; Pipestone, MN; Moody, SD |
| Headline | Severe Thunderstorm Warning issued May 24 at 8:01PM CDT until May 24 at 8:45PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-24T20:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.436f55dcf855b9cfcb4b5a905b15f63f73bd2d5d.001.1","noaa_urn:oid:2.49.0.1.840.0.6ece43e4bd1a8384347fe1224d32f66494d3a782.001.1","noaa_urn:oid:2.49.0.1.840.0.a00ab0ed4f41001f52013ec2c0d04f8e844fc833.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | Scotland |
| Iem County | Bon Homme |
| Iem State | SD |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_43.210_-97.780_1779663480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779663480000,"latitude":43.21,"longitude":-97.78},{"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_43.080_-97.720_1779666660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779666660000,"latitude":43.08,"longitude":-97.72},{"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_43.080_-97.720_1779667560000","source":"iem","severity":"low","severityValue":25,"timestamp":1779667560000,"latitude":43.08,"longitude":-97.72},{"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_43.150_-97.720_1779666600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779666600000,"latitude":43.15,"longitude":-97.72}] |
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.
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