Right now
The most recent data we hold from NOAA arrived 7 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 10 June 2026 at 00:30 UTC. It is kept here as a record.
It is the 16th strongest of the 24 detections recorded within 20 km of this point since 9 June 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 9 at 5:29PM MDT until June 9 at 6:30PM MDT by NWS Rapid City SD
Nearby, since 9 June 2026
- July 6, 2026 · score 22 · 6.5 km
- June 9, 2026 · score 16 · 15.0 km
- July 9, 2026 · score 22 · 15.7 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.
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) | 16 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 42.4980, -102.4189 |
| Nearest City | Rapid City (188 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-09T23:29:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7d77ecca4d01164b0df838f5064f8995 |
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: 2026-06-09T23:29:00.000Z.
First archived: 2026-06-09T23:39:00.018Z. 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 | Bennett, SD; Jackson, SD; Oglala Lakota, SD; Arthur, NE; Garden, NE; Grant, NE; Sheridan, NE |
| Headline | Severe Thunderstorm Warning issued June 9 at 5:29PM MDT until June 9 at 6:30PM MDT by NWS Rapid City SD |
| Expires | 2026-06-09T18:30:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7d77ecca4d01164b0df838f5064f8995d727174b.001.1","noaa_urn:oid:2.49.0.1.840.0.ec31d1e52d56ad53f97c7daae77433ade08b63e5.001.1","noaa_urn:oid:2.49.0.1.840.0.1516f0d90a0eb190f52297152500acbd86dc7219.001.1"] |
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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