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 23 June 2026 at 02:45 UTC. It is kept here as a record.
No stronger detection stands among the 62 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. 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 8:30PM MDT until June 22 at 8:45PM MDT by NWS Rapid City SD
Nearby, since 15 March 2026
- September 7, 2026 · score 16 · 20.1 km
How we know
7 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 | 0.70/1 |
| Coordinates | 43.8843, -104.2071 |
| Nearest City | Rapid City (81 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-23T02:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d5181fb8a3bb716e065e8d619f78ee27b919e906.001.1 |
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: 2026-06-23T02:30:00.000Z.
First archived: 2026-06-23T02:34:58.032Z. 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 | Weston, WY |
| Headline | Severe Thunderstorm Warning issued June 22 at 8:30PM MDT until June 22 at 8:45PM MDT by NWS Rapid City SD |
| Expires | 2026-06-22T20:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | inch |
| Iem City | 3 WSW Galena |
| Iem County | Lawrence |
| Iem State | SD |
| Iem Wfo | UNR |
| Iem Remark | Large quantities of hail covering the ground and roads to a depth of 2-3 inches. Most stones dime and nickel size. Initial stones when the hail started were quarter size. Time estimated based on radar |
| MergedSources | [{"id":"iem_H_44.190_-103.500_1782170280000","source":"iem","severity":"low","severityValue":25,"timestamp":1782170280000,"latitude":44.19,"longitude":-103.5},{"id":"iem_H_44.110_-104.880_1782178860000","source":"iem","severity":"low","severityValue":25,"timestamp":1782178860000,"latitude":44.11,"longitude":-104.88},{"id":"iem_H_44.290_-103.680_1782168420000","source":"iem","severity":"low","severityValue":25,"timestamp":1782168420000,"latitude":44.29,"longitude":-103.68},{"id":"iem_C_44.230_-103.540_1782169320000","source":"iem","severity":"low","severityValue":25,"timestamp":1782169320000,"latitude":44.23,"longitude":-103.54},{"id":"iem_H_44.300_-103.680_1782168360000","source":"iem","severity":"low","severityValue":25,"timestamp":1782168360000,"latitude":44.3,"longitude":-103.68},{"id":"iem_H_44.320_-103.700_1782168000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782168000000,"latitude":44.32,"longitude":-103.7}] |
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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