Right now
The most recent data we hold from NOAA arrived 17 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 22 June 2026 at 21:15 UTC. It is kept here as a record.
It is the 4th strongest of the 10 detections recorded within 20 km of this point since 22 June 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 22 at 2:59PM MDT until June 22 at 3:15PM MDT by NWS Rapid City SD
Nearby, since 22 June 2026
- June 22, 2026 · score 46 · 16.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 22 / 100 |
| Legacy data-support index | 0.57/1 |
| Coordinates | 43.1576, -104.8341 |
| Nearest City | Casper (124 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Date | 2026-06-22 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.64de5c9b4080df5ce567daab2ba05f7e |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-22 — time not reported.
First archived: 2026-06-22T21:00:29.879Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Campbell, WY; Big Horn, MT; Rosebud, MT; Sioux, NE; Niobrara, WY and 4 more areas |
| Headline | Severe Thunderstorm Warning issued June 22 at 2:59PM MDT until June 22 at 3:15PM MDT by NWS Rapid City SD |
| Expires | 2026-06-22T15:15:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.64de5c9b4080df5ce567daab2ba05f7e4725f2ed.001.1","noaa_urn:oid:2.49.0.1.840.0.59e8493c0e8ea8a8cdc251b229ceea57fe45dbbd.001.1","noaa_urn:oid:2.49.0.1.840.0.d9660abfefb5ea692609d2254c03670c10cbf3f5.001.1","noaa_urn:oid:2.49.0.1.840.0.656fc8d0f573cd1a6341b3ed620740fb7d9b9848.001.1","noaa_urn:oid:2.49.0.1.840.0.2649b7c1563e32872ccf53f74f25fee4a92186ea.001.1","noaa_urn:oid:2.49.0.1.840.0.d8dedc22547dc38ae2c4f8fd7765864508f5e511.001.1","noaa_urn:oid:2.49.0.1.840.0.87c6c6a375e79ff7814680385b45f2a7461156be.001.1","noaa_urn:oid:2.49.0.1.840.0.67e1c2b7f759fbab9fb6f2fa63467cd3d343a385.001.1"] |
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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