Right now
The most recent data we hold from NOAA arrived 74 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 01:15 UTC. It is kept here as a record.
No stronger detection stands among the 16 recorded within 20 km of this point since 14 May 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 27 at 6:42PM MDT until June 27 at 7:15PM MDT by NWS Rapid City SD
How we know
6 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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 | Critical |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.68/1 |
| Coordinates | 46.4585, -103.1838 |
| Nearest City | Dickinson (56 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-28T00:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.7c9b216b67436d7cdc896a57c7ee4692 |
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: 2026-06-28T00:42:00.000Z.
First archived: 2026-06-28T00:51:04.262Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Harding, SD; Perkins, SD; Billings, ND |
| Headline | Tornado Warning issued June 27 at 6:42PM MDT until June 27 at 7:15PM MDT by NWS Rapid City SD |
| Expires | 2026-06-27T19:15:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7c9b216b67436d7cdc896a57c7ee4692a3cbde9d.001.1","noaa_urn:oid:2.49.0.1.840.0.1ccf472d013da8fec97027d25953a8fc20f02b61.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 82 |
| Iem Unit | MPH |
| Iem City | 3 ESE Griffin |
| Iem County | Bowman |
| Iem State | ND |
| Iem Wfo | BIS |
| Iem Remark | 82 MPH wind gust measured at NDAWN 4W Bowman. |
| MergedSources | [{"id":"iem_G_46.230_-103.710_1782605760000","source":"iem","severity":"low","severityValue":25,"timestamp":1782605760000,"latitude":46.23,"longitude":-103.71},{"id":"iem_G_46.160_-103.300_1782606540000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606540000,"latitude":46.16,"longitude":-103.3},{"id":"iem_H_46.470_-104.090_1782603480000","source":"iem","severity":"low","severityValue":25,"timestamp":1782603480000,"latitude":46.47,"longitude":-104.09},{"id":"iem_G_46.230_-103.700_1782605820000","source":"iem","severity":"low","severityValue":25,"timestamp":1782605820000,"latitude":46.23,"longitude":-103.7},{"id":"iem_G_46.200_-103.470_1782606300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782606300000,"latitude":46.2,"longitude":-103.47}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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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