Right now
The most recent data we hold from NOAA arrived 11 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 27 June 2026 at 03:00 UTC. It is kept here as a record.
No stronger detection stands among the 143 recorded within 20 km of this point since 15 March 2026 — 48 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 26 at 8:28PM MDT until June 26 at 9:00PM MDT by NWS Rapid City SD
Urban PEI: 73,569 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 3, 2026 · score 39 · 4.0 km
- July 2, 2026 · score 39 · 7.1 km
- June 5, 2026 · score 39 · 9.0 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.83/1 |
| Coordinates | 44.2255, -102.8036 |
| Nearest City | Rapid City (38 km) |
| Urban exposure index (PEI) | 73.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-27T02:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.92568c3092d1ff39e48802bd342b3bc2 |
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: 2026-06-27T02:28:00.000Z.
First archived: 2026-06-27T02:35:26.181Z. 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 | Butte, SD; Meade, SD; Pennington, SD; Meade, SD; Pennington, SD |
| Headline | Severe Thunderstorm Warning issued June 26 at 8:28PM MDT until June 26 at 9:00PM MDT by NWS Rapid City SD |
| Expires | 2026-06-26T21:00:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.92568c3092d1ff39e48802bd342b3bc272df2bdc.002.1","noaa_urn:oid:2.49.0.1.840.0.bf498131d5a9f780b5097fae75b011c1b1cd10e5.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | mph |
| Iem City | 7 E Sturgis |
| Iem County | Meade |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_44.420_-103.380_1782524100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524100000,"latitude":44.42,"longitude":-103.38}] |
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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