Right now
The most recent data we hold from NOAA arrived 7 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 27 September 2026 at 17:45 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 4 April 2026. The last comparable one was on 18 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 27 at 12:22PM CDT until September 27 at 12:45PM CDT by NWS Aberdeen SD
Nearby, since 4 April 2026
- June 27, 2026 · 17.0 km
- June 2, 2026 · 22.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 44.4650, -100.8900 |
| Nearest City | Rapid City (191 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-27T17:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0ce21c9d8385ed754a544c9d2d0b6d46b4f08b77.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-27T17:22:00.000Z.
First archived: 2026-09-27T16:52:35.676Z. Material modification: 2026-09-27T17:24:59.697Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2 retained revisions changed source fields this page does not show; the index, severity and version stayed the same.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| MessageId | urn:oid:2.49.0.1.840.0.0ce21c9d8385ed754a544c9d2d0b6d46b4f08b77.001.1 |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Stanley, SD |
| Headline | Severe Thunderstorm Warning issued September 27 at 12:22PM CDT until September 27 at 12:45PM CDT by NWS Aberdeen SD |
| Expires | 2026-09-27T12:45:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 66 |
| Spc Location | 10 NW Okobojo Creek Rec |
| Spc County | Sully |
| Spc State | SD |
| Spc Comments | Ambient weather station. (ABR) |
| Iem TypeSummary | Thunderstorm wind gust |
| Iem LsrCode | G |
| Iem LsrType | TSTM WND GST |
| Iem Magnitude | 66 |
| Iem Unit | MPH |
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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