Right now
The most recent data we hold from NOAA arrived 2 hours 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 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 34 recorded within 20 km of this point since 8 April 2026 — 11 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 31 at 5:56PM CDT until May 31 at 6:30PM CDT by NWS Aberdeen SD
An estimated 28,102 people live within 50 km of this point.
Nearby, since 8 April 2026
- May 31, 2026 · score 40 · 5.5 km
- June 1, 2026 · score 40 · 10.8 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 40 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 | High |
| Calamity Score (ours) | 40 / 100 |
| Our confidence | 89% |
| Coordinates | 45.6980, -98.9240 |
| Nearest City | Aberdeen (43 km) |
| Population Exposed | 28.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T22:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1b94b698eec26747b2ef520dee942c52aaefd4b6.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | McPherson, SD |
| Headline | Severe Thunderstorm Warning issued May 31 at 5:56PM CDT until May 31 at 6:30PM CDT by NWS Aberdeen SD |
| Expires | 2026-05-31T18:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 6 ESE Roscoe |
| Spc County | Edmunds |
| Spc State | SD |
| Spc Comments | Mostly dime size hail with the largest stones quarter size. Time estimated by radar. (ABR) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 6 SE Roscoe |
| Iem County | Edmunds |
| Iem State | SD |
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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