Right now
The most recent data we hold from NOAA arrived 2 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 02:15 UTC. It is kept here as a record.
No stronger detection stands among the 22 recorded within 20 km of this point since 8 April 2026 — 8 others scored the same. The last comparable one was on 8 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 7:51PM MDT until June 27 at 8:15PM MDT by NWS Rapid City SD
Nearby, since 8 April 2026
- July 30, 2026 · score 22 · 21.9 km
How we know
8 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 | 0.69/1 |
| Coordinates | 45.5774, -102.9014 |
| Nearest City | Dickinson (145 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T01:51:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.d521f80ed20d4b899a3c85081d45f593 |
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: 2026-06-28T01:51:00.000Z.
First archived: 2026-06-28T01:54:10.138Z. 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 | Haakon, SD; Jackson, SD; Mellette, SD; Ziebach, SD; Cherry, NE; Sheridan, NE; Dewey, SD; Stanley, SD and 9 more areas |
| Headline | Severe Thunderstorm Warning issued June 27 at 7:51PM MDT until June 27 at 8:15PM MDT by NWS Rapid City SD |
| Expires | 2026-06-27T20:15:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d521f80ed20d4b899a3c85081d45f5930b7f6753.002.1","noaa_urn:oid:2.49.0.1.840.0.9003437e7a4f55d860f5bf821f7ca40615c3752c.001.1","noaa_urn:oid:2.49.0.1.840.0.b5ca508aa90e881cfcf6bf78cde9fe8f11bde199.001.1","noaa_urn:oid:2.49.0.1.840.0.9c04ea3ff729d5248757e7791a8189e4015a5d7c.001.1","noaa_urn:oid:2.49.0.1.840.0.d2928ca0361f5f472b2a3959bef7903bcf9ad298.001.1","noaa_urn:oid:2.49.0.1.840.0.2a46db1295550654603339d1cef4f3568ac403fa.001.1","noaa_urn:oid:2.49.0.1.840.0.cacc06845dcc31a40e8cfee116a51383225e051e.001.1","noaa_urn:oid:2.49.0.1.840.0.58581fbf4d0bd468ef2fd7300fff6d8bca85f4da.001.1","noaa_urn:oid:2.49.0.1.840.0.08f7212d9e4ab29356f43da0666f977cc7a54dfe.002.1","noaa_urn:oid:2.49.0.1.840.0.97f748031cc8a0e54066933997a5fe735d48508e.001.1","noaa_urn:oid:2.49.0.1.840.0.f9a76d43e171ee8833baec932265953eb9413f0e.001.1","noaa_urn:oid:2.49.0.1.840.0.6301db8745e595dc91af4604c0a9c2064bfa47fc.001.1","noaa_urn:oid:2.49.0.1.840.0.49f460f0b6913ea71a4db7c2b740b98d5b1acebe.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | mph |
| Iem City | 1 N Buffalo |
| Iem County | Harding |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_45.830_-103.720_1782604800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782604800000,"latitude":45.83,"longitude":-103.72},{"id":"iem_G_45.880_-103.380_1782606300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606300000,"latitude":45.88,"longitude":-103.38},{"id":"iem_G_45.340_-102.920_1782609300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782609300000,"latitude":45.34,"longitude":-102.92},{"id":"iem_G_45.880_-103.380_1782605700000","source":"iem","severity":"low","severityValue":25,"timestamp":1782605700000,"latitude":45.88,"longitude":-103.38},{"id":"iem_H_45.550_-103.350_1782606480000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606480000,"latitude":45.55,"longitude":-103.35},{"id":"iem_H_45.590_-103.670_1782602940000","source":"iem","severity":"low","severityValue":25,"timestamp":1782602940000,"latitude":45.59,"longitude":-103.67},{"id":"iem_G_45.600_-103.550_1782605220000","source":"iem","severity":"low","severityValue":25,"timestamp":1782605220000,"latitude":45.6,"longitude":-103.55}] |
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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