Right now
The most recent data we hold from NOAA arrived 52 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 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 28 recorded within 20 km of this point since 19 March 2026 — 16 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 5:35PM MDT until June 27 at 6:00PM MDT by NWS Rapid City SD
Nearby, since 19 March 2026
- September 6, 2026 · score 16 · 19.5 km
How we know
5 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 | 0.67/1 |
| Coordinates | 45.7119, -104.1937 |
| Nearest City | Dickinson (169 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T23:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.37b9a039a48bb0d59a0649d8c5b033dc |
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: 2026-06-27T23:35:00.000Z.
First archived: 2026-06-27T23:38:42.154Z. 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 | Harding, SD; Custer, SD; Haakon, SD; Meade, SD; Oglala Lakota, SD; Pennington, SD; Carter, MT; Custer, MT; Fallon, MT and 7 more areas |
| Headline | Severe Thunderstorm Warning issued June 27 at 5:35PM MDT until June 27 at 6:00PM MDT by NWS Rapid City SD |
| Expires | 2026-06-27T18:00:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 11 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.37b9a039a48bb0d59a0649d8c5b033dca2c27b4b.001.1","noaa_urn:oid:2.49.0.1.840.0.45a6dcb7a522bb1a831663aa86e50719cbdb31d1.001.1","noaa_urn:oid:2.49.0.1.840.0.18405a0940844e7802b5e94679eff5ddec572628.001.1","noaa_urn:oid:2.49.0.1.840.0.29c68c8d3bc32a54bbfb751ddd15b62fbc617021.001.1","noaa_urn:oid:2.49.0.1.840.0.0a5512bfe6af6beed54c2dc7934cc5585373fee1.001.1","noaa_urn:oid:2.49.0.1.840.0.985d0be6f89ebe458a0107b26e9f2620e430080f.001.1","noaa_urn:oid:2.49.0.1.840.0.d918ddd6f6c7662b696d9aca7efe35ae58fcf9a3.001.1","noaa_urn:oid:2.49.0.1.840.0.7f06434f1ffdf38bc282024e0b60fde6276ff875.001.1","noaa_urn:oid:2.49.0.1.840.0.1c0b4b22ae0240db75b0a51cf6565dc3a86a65d2.001.1","noaa_urn:oid:2.49.0.1.840.0.ab47ef2afd3db735a7c8f6b9bd443ed06b552990.001.1","noaa_urn:oid:2.49.0.1.840.0.ee80fef3f83428995f33d671b9b912deae08a8bd.001.1"] |
| Iem TypeSummary | C |
| Iem City | 8 SE Ekalaka |
| Iem County | Carter |
| Iem State | MT |
| Iem Wfo | BYZ |
| Iem Remark | Report from EM. |
| MergedSources | [{"id":"iem_H_45.890_-104.550_1782598680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782598680000,"latitude":45.89,"longitude":-104.55},{"id":"iem_H_45.500_-104.450_1782601800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782601800000,"latitude":45.5,"longitude":-104.45},{"id":"iem_H_46.030_-104.080_1782602880000","source":"iem","severity":"low","severityValue":25,"timestamp":1782602880000,"latitude":46.03,"longitude":-104.08},{"id":"iem_C_45.820_-104.430_1782600300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782600300000,"latitude":45.82,"longitude":-104.43}] |
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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