Right now
The most recent data we hold from NOAA arrived 81 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 32 recorded within 20 km of this point since 15 March 2026 — 12 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 27 at 9:07PM CDT until June 27 at 9:45PM CDT by NWS Bismarck ND
How we know
3 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 | 45.3011, -102.5480 |
| Nearest City | Rapid City (146 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T02:07:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.78b2c5e9cd15a0336ac107345cd3a3a9 |
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: 2026-06-28T02:07:00.000Z.
First archived: 2026-06-28T02:09:58.074Z. 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 | Adams, ND; Grant, ND; Hettinger, ND; Morton, ND; Sioux, ND; Stark, ND; Billings, ND; Dunn, ND; McKenzie, ND; McLean, ND; Mercer, ND; Morton, ND; Mountrail, ND; Oliver, ND; Stark, ND; Williams, ND; Perkins, SD and 10 more areas |
| Headline | Severe Thunderstorm Warning issued June 27 at 9:07PM CDT until June 27 at 9:45PM CDT by NWS Bismarck ND |
| Expires | 2026-06-27T21:45:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.78b2c5e9cd15a0336ac107345cd3a3a9e1813be4.001.1","noaa_urn:oid:2.49.0.1.840.0.ec6dec88c8ee65fb0c562ade5fdba7686bf68a5a.001.1","noaa_urn:oid:2.49.0.1.840.0.f9dffba72d1876836eae0eb0cdadf7474769727d.001.1","noaa_urn:oid:2.49.0.1.840.0.bf3dc8cec149cae950d7b6c7bd84774b80a7dd9a.001.1","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:2.49.0.1.840.0.97f748031cc8a0e54066933997a5fe735d48508e.001.1","noaa_urn:oid:2.49.0.1.840.0.f9a76d43e171ee8833baec932265953eb9413f0e.001.1","noaa_urn:oid:2.49.0.1.840.0.2b648d6f296656fdb9e279c4ceb0eac8bfbc2dbd.001.1","noaa_urn:oid:2.49.0.1.840.0.36bff9a84c7172cbd6fad5030a104e869ea8ba7a.001.1","noaa_urn:oid:2.49.0.1.840.0.fd74e1a367a9d88cf6a6bc91c6c5ed61b663878c.001.1","noaa_urn:oid:2.49.0.1.840.0.3fcc260c45d057ac78428cee04ac65fa6c791698.001.1","noaa_urn:oid:2.49.0.1.840.0.bbe5f7854619d56854a39c07629dda7890902019.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | inch |
| Iem City | 10 ESE Buffalo |
| Iem County | Harding |
| Iem State | SD |
| Iem Wfo | UNR |
| Iem Remark | Along Highway 20. Reported via Spotter Network. |
| MergedSources | [{"id":"iem_G_45.340_-102.920_1782609300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782609300000,"latitude":45.34,"longitude":-102.92},{"id":"iem_H_45.550_-103.350_1782606480000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606480000,"latitude":45.55,"longitude":-103.35}] |
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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