Right now
The most recent data we hold from NOAA arrived 8 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 4 June 2026 at 01:15 UTC. It is kept here as a record.
It is the 140th strongest of the 177 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 3 June 2026. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 3 at 7:51PM CDT until June 3 at 8:15PM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- July 5, 2026 · score 22 · 16.9 km
- August 31, 2026 · score 22 · 22.2 km
- August 27, 2026 · score 22 · 22.2 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, at 61 % 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 | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 61% |
| Coordinates | 43.7725, -99.1868 |
| Nearest City | Mitchell (93 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-04T00:51:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ddfcb4b4186874475ce7aafde771134e |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Brule, SD; Lyman, SD |
| Headline | Severe Thunderstorm Warning issued June 3 at 7:51PM CDT until June 3 at 8:15PM CDT by NWS Sioux Falls SD |
| Expires | 2026-06-03T20:15:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ddfcb4b4186874475ce7aafde771134e513513a9.001.1","noaa_urn:oid:2.49.0.1.840.0.21f45dc9dbac18e3ac0ae5bf1fe21977882a9a07.001.1"] |
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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