Right now
The most recent data we hold from NOAA arrived 5 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 5 June 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 169 recorded within 20 km of this point since 15 March 2026 — 23 others scored the same. Another comparable one was recorded here earlier the same day. 26 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 4 at 5:24PM MDT until June 4 at 6:00PM MDT by NWS Cheyenne WY
An estimated 73,569 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 3, 2026 · score 39 · 1.9 km
- July 30, 2026 · score 39 · 12.0 km
- June 2, 2026 · score 39 · 15.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 81 % 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) | 39 / 100 |
| Our confidence | 81% |
| Coordinates | 44.0850, -103.5333 |
| Nearest City | Rapid City (24 km) |
| Population Exposed | 73.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-04T23:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ff62aa6bdd9b82990a9ae8f1b4910fd3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dawes, NE; Sioux, NE; Pennington, SD; Harding, SD; Perkins, SD |
| Headline | Severe Thunderstorm Warning issued June 4 at 5:24PM MDT until June 4 at 6:00PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-04T18:00:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ff62aa6bdd9b82990a9ae8f1b4910fd37824dab4.001.1","noaa_urn:oid:2.49.0.1.840.0.6ba716cfec5a80a43ecf7dee909c89a2fdd17306.002.1","noaa_urn:oid:2.49.0.1.840.0.001578f3d3f81b2fc6bb0b83a75080c66103911a.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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