Right now
The most recent data we hold from NOAA arrived 32 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 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 — 23 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 8:19PM MDT until June 27 at 8:45PM MDT by NWS Rapid City SD
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 | 0.64/1 |
| Coordinates | 45.2990, -102.3474 |
| Nearest City | Rapid City (152 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T02:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5a1503a897eb678956b92ae4cd2dcc56 |
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: 2026-06-28T02:19:00.000Z.
First archived: 2026-06-28T02:20:37.488Z. 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 | Perkins, SD; Adams, ND; Grant, ND; Hettinger, ND; Dewey, SD; Stanley, SD and 10 more areas |
| Headline | Severe Thunderstorm Warning issued June 27 at 8:19PM MDT until June 27 at 8:45PM MDT by NWS Rapid City SD |
| Expires | 2026-06-27T20:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5a1503a897eb678956b92ae4cd2dcc56f55895a1.001.1","noaa_urn:oid:2.49.0.1.840.0.020f83425c0b3d9a30496330ce7badaa3031e6bb.001.1","noaa_urn:oid:2.49.0.1.840.0.7c39575bc79d6ccaff8f8280b88bfac42f0a0449.001.1","noaa_urn:oid:2.49.0.1.840.0.78b2c5e9cd15a0336ac107345cd3a3a9e1813be4.001.1","noaa_urn:oid:2.49.0.1.840.0.2b648d6f296656fdb9e279c4ceb0eac8bfbc2dbd.001.1","noaa_urn:oid:2.49.0.1.840.0.0bfcd870c16aaf85fa810dbfe0c5c2357eabc3cb.002.1","noaa_urn:oid:2.49.0.1.840.0.3692e5c260c226e46c261a954271b310acbe9aae.001.1","noaa_urn:oid:2.49.0.1.840.0.214c9c5c989c2a76e79aa73425ee8362b8d67fd9.001.1","noaa_urn:oid:2.49.0.1.840.0.727fa26dce8da79beed38d8db1a71b3b35305871.001.1","noaa_urn:oid:2.49.0.1.840.0.72e81d4c9d22f14bf7d7bb4e821271144a91120e.001.1","noaa_urn:oid:2.49.0.1.840.0.29962a309af75ea1b23daecf16ab2fd7bec42b38.001.1","noaa_urn:oid:2.49.0.1.840.0.f7ea64a2ec0db58d0ba6deb3ef4f1b4ad29cb543.001.1","noaa_urn:oid:2.49.0.1.840.0.36bff9a84c7172cbd6fad5030a104e869ea8ba7a.001.1","noaa_urn:oid:2.49.0.1.840.0.97f748031cc8a0e54066933997a5fe735d48508e.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 54 |
| Iem Unit | mph |
| Iem City | 8 S Sorum |
| Iem County | Perkins |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_45.340_-102.920_1782609300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782609300000,"latitude":45.34,"longitude":-102.92}] |
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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