Right now
The most recent data we hold from NOAA arrived 78 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 31 May 2026 at 23:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 45 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 31 at 6:27PM CDT until May 31 at 6:45PM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- May 31, 2026 · score 58 · 5.2 km
- May 31, 2026 · score 43 · 10.3 km
- June 1, 2026 · score 40 · 16.6 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 46 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 | Critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 69% |
| Coordinates | 43.6100, -97.4240 |
| Nearest City | Mitchell (50 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-31T23:27:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.789297f90adabea948f07920cd870f6edebcf4a5.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McCook, SD |
| Headline | Tornado Warning issued May 31 at 6:27PM CDT until May 31 at 6:45PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-31T18:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Spc ReportType | tornado |
| Spc Speed | UNK |
| Spc Location | 1 NW Bridgewater |
| Spc County | McCook |
| Spc State | SD |
| Spc Comments | Tornado is kicking up dust from the ground now. (FSD) |
| Iem TypeSummary | T |
| Iem City | 1 NW Bridgewater |
| Iem County | McCook |
| Iem State | SD |
| Iem Wfo | FSD |
| Iem Remark | Tornado is kicking up dust from the ground now. |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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