Right now
The most recent data we hold from NOAA arrived 3 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 27 June 2026 at 03:45 UTC. It is kept here as a record.
It is the 27th strongest of the 92 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 26 at 8:52PM MDT until June 26 at 9:45PM MDT by NWS Rapid City SD
Nearby, since 17 March 2026
- June 27, 2026 · score 39 · 13.3 km
- June 3, 2026 · score 39 · 19.6 km
How we know
15 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 | 0.68/1 |
| Coordinates | 44.3878, -102.7489 |
| Nearest City | Rapid City (51 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-27T02:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.eed153a45d3adfeef340fe0afa663519 |
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: 2026-06-27T02:52:00.000Z.
First archived: 2026-06-27T02:56:31.931Z. 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; Meade, SD; Pennington, SD; Ziebach, SD; Meade, SD; Pennington, SD |
| Headline | Severe Thunderstorm Warning issued June 26 at 8:52PM MDT until June 26 at 9:45PM MDT by NWS Rapid City SD |
| Expires | 2026-06-26T21:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eed153a45d3adfeef340fe0afa6635198fc6e7a0.001.1","noaa_urn:oid:2.49.0.1.840.0.4ed1860f4252dd844c6eee802c8b3274579954b7.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 51 |
| Iem Unit | mph |
| Iem City | 2 ENE Rockerville |
| Iem County | Pennington |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_44.000_-103.000_1782527100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782527100000,"latitude":44,"longitude":-103},{"id":"iem_G_44.680_-103.560_1782524100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524100000,"latitude":44.68,"longitude":-103.56},{"id":"iem_G_44.230_-103.040_1782527100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782527100000,"latitude":44.23,"longitude":-103.04},{"id":"iem_G_44.240_-103.250_1782526680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526680000,"latitude":44.24,"longitude":-103.25},{"id":"iem_G_44.020_-103.240_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":44.02,"longitude":-103.24},{"id":"iem_G_44.070_-103.210_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":44.07,"longitude":-103.21},{"id":"iem_G_44.050_-103.060_1782526740000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526740000,"latitude":44.05,"longitude":-103.06},{"id":"iem_G_43.970_-103.330_1782525600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525600000,"latitude":43.97,"longitude":-103.33},{"id":"iem_G_44.120_-103.090_1782526800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526800000,"latitude":44.12,"longitude":-103.09},{"id":"iem_G_44.150_-103.100_1782526680000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526680000,"latitude":44.15,"longitude":-103.1},{"id":"iem_G_44.420_-103.380_1782524100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782524100000,"latitude":44.42,"longitude":-103.38},{"id":"iem_H_44.050_-103.490_1782525300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782525300000,"latitude":44.05,"longitude":-103.49},{"id":"iem_G_44.000_-103.000_1782526800000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526800000,"latitude":44,"longitude":-103},{"id":"iem_G_43.970_-103.330_1782526200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782526200000,"latitude":43.97,"longitude":-103.33}] |
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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