Right now
The most recent data we hold from NOAA arrived 20 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.
No stronger detection stands among the 42 recorded within 20 km of this point since 15 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 12 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 24 at 7:57PM 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 15 March 2026
- June 18, 2026 · score 43 · 13.3 km
How we know
Confirmed by 3 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 | 43.5956, -96.2164 |
| Nearest City | Sioux Falls (42 km) |
| Population Exposed | 171.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-25T00:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6ece43e4bd1a8384347fe1224d32f664 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Yankton, SD; Murray, MN; Nobles, MN; Pipestone, MN; Moody, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 24 at 7:57PM 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 | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6ece43e4bd1a8384347fe1224d32f66494d3a782.001.1","noaa_urn:oid:2.49.0.1.840.0.3966cc39bdecb4777809e369253d1c0d96b42ba6.001.1","noaa_urn:oid:2.49.0.1.840.0.a00ab0ed4f41001f52013ec2c0d04f8e844fc833.001.1","noaa_urn:oid:2.49.0.1.840.0.aa36b329baf40eb41565533fe1337c904b653c2a.002.1","noaa_urn:oid:2.49.0.1.840.0.8f428f394831e134b38788cec6c06c9ad808f9bb.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 5 SSW Chandler |
| Iem County | Murray |
| Iem State | MN |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_44.000_-96.310_1779661200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779661200000,"latitude":44,"longitude":-96.31},{"id":"iem_H_43.870_-95.990_1779668280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779668280000,"latitude":43.87,"longitude":-95.99}] |
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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