Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 9 km from here.
This alert expired on 8 September 2026 at 05:30 UTC. It is kept here as a record.
It is the 28th strongest of the 65 detections recorded within 20 km of this point since 13 April 2026. The last comparable one was on 5 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 7 at 11:57PM CDT until September 8 at 12:30AM CDT by NWS Sioux Falls SD
An estimated 171,544 people live within 50 km of this point.
Nearby, since 13 April 2026
- September 8, 2026 · score 37 · 11.0 km
- May 31, 2026 · score 58 · 19.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 86% |
| Coordinates | 43.4519, -97.3056 |
| Nearest City | Sioux Falls (47 km) |
| Population Exposed | 171.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-08T04:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8408154ed44c78b7808e75aa3eeae4457e069ce2.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lyon, IA; Sioux, IA; Lincoln, SD; Minnehaha, SD; Aurora, SD; Charles Mix, SD; Davison, SD; Douglas, SD; Hanson, SD; Hutchinson, SD; Turner, SD |
| Headline | Severe Thunderstorm Warning issued September 7 at 11:57PM CDT until September 8 at 12:30AM CDT by NWS Sioux Falls SD |
| Expires | 2026-09-08T00:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8408154ed44c78b7808e75aa3eeae4457e069ce2.001.1","noaa_urn:oid:2.49.0.1.840.0.d4e07dcaa64df22802dfef47299ea9dfb9b3d195.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 5 NNE Delmont |
| Spc County | Douglas |
| Spc State | SD |
| Spc Comments | Personal weather station reported a 60 mph wind gust. (FSD) |
| MergedSources | [{"id":"spc_wind_43.34_-98.14_36","source":"spc","severity":"medium","severityValue":45,"timestamp":1788842040000,"latitude":43.34,"longitude":-98.14}] |
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 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.