Right now
The most recent data we hold from NOAA arrived 19 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 28 June 2026 at 00:30 UTC. It is kept here as a record.
It is the 9th strongest of the 77 detections recorded within 20 km of this point since 22 March 2026. The last comparable one was on 23 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 6:00PM MDT until June 27 at 6:30PM MDT by NWS Cheyenne WY
Nearby, since 22 March 2026
- May 30, 2026 · score 16 · 3.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
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 | 0.62/1 |
| Coordinates | 43.3150, -102.8717 |
| Nearest City | Rapid City (90 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T00:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7e5d39dd582d3fba9bd22365fb0bdcf2 |
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: 2026-06-28T00:00:00.000Z.
First archived: 2026-06-28T00:04:20.829Z. 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 | Box Butte, NE; Dawes, NE; Custer, SD; Fall River, SD; Oglala Lakota, SD; Pennington, SD; Custer, SD; Haakon, SD; Meade, SD; Oglala Lakota, SD; Pennington, SD |
| Headline | Severe Thunderstorm Warning issued June 27 at 6:00PM MDT until June 27 at 6:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-06-27T18:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7e5d39dd582d3fba9bd22365fb0bdcf23d1c2bb0.001.1","noaa_urn:oid:2.49.0.1.840.0.beb705352ecefc86beed6222aff5c64133a50a52.001.1","noaa_urn:oid:2.49.0.1.840.0.5cc0a020f5ce173896dddba52049145d801869de.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | mph |
| Iem City | Pringle |
| Iem County | Custer |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_43.610_-103.590_1782599640000","source":"iem","severity":"low","severityValue":25,"timestamp":1782599640000,"latitude":43.61,"longitude":-103.59}] |
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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