Right now
The most recent data we hold from NOAA arrived 12 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.
No stronger detection stands among the 43 recorded within 20 km of this point since 25 May 2026 — one other scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued May 31 at 6:15PM CDT until May 31 at 6:45PM CDT by NWS Sioux Falls SD
An estimated 15,669 people live within 50 km of this point.
Nearby, since 25 May 2026
- June 1, 2026 · score 40 · 13.0 km
- May 31, 2026 · score 43 · 15.2 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 58 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 | Critical |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 89% |
| Coordinates | 43.5786, -97.4714 |
| Nearest City | Mitchell (47 km) |
| Population Exposed | 15.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T23:15:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3a0946faec21710b9f5f8c0cdecd863fa8f2fd2f.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McCook, SD |
| Headline | Tornado Warning issued May 31 at 6:15PM 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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