This alert expired on 29 August 2026 at 23:45 UTC. It is kept here as a record.
It is the 9th strongest of the 73 detections recorded within 20 km of this point since 22 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 29 at 5:21PM MDT until August 29 at 5:45PM MDT by NWS Rapid City SD
Nearby, since 22 March 2026
- August 12, 2026 · score 22 · 21.4 km
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 71% |
| Coordinates | 43.0725, -102.6629 |
| Nearest City | Rapid City (121 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-29T23:21:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Oglala Lakota, SD; Dawes, NE; Bennett, SD; Jackson, SD; Oglala Lakota, SD |
| Headline | Severe Thunderstorm Warning issued August 29 at 5:21PM MDT until August 29 at 5:45PM MDT by NWS Rapid City SD |
| Expires | 2026-08-29T17:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.dd84d533dc8ca02503f656e467321e4b70c825b0.002.1","noaa_urn:oid:2.49.0.1.840.0.590ce30cdcc714107e965129242ede57502c637d.001.1","noaa_urn:oid:2.49.0.1.840.0.a4cac5d6f23c5ad1912f689cef3fd722955a1803.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | mph |
| Iem City | 3 ESE Pine Ridge |
| Iem County | Oglala Lakota |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_42.830_-103.100_1788043980000","source":"iem","severity":"low","severityValue":25,"timestamp":1788043980000,"latitude":42.83,"longitude":-103.1},{"id":"iem_G_43.190_-103.000_1788045240000","source":"iem","severity":"low","severityValue":25,"timestamp":1788045240000,"latitude":43.19,"longitude":-103},{"id":"iem_G_43.100_-103.050_1788044100000","source":"iem","severity":"low","severityValue":25,"timestamp":1788044100000,"latitude":43.1,"longitude":-103.05},{"id":"iem_G_43.040_-103.350_1788043200000","source":"iem","severity":"low","severityValue":25,"timestamp":1788043200000,"latitude":43.04,"longitude":-103.35},{"id":"iem_G_42.750_-103.310_1788043080000","source":"iem","severity":"low","severityValue":25,"timestamp":1788043080000,"latitude":42.75,"longitude":-103.31},{"id":"iem_G_42.830_-103.100_1788043440000","source":"iem","severity":"low","severityValue":25,"timestamp":1788043440000,"latitude":42.83,"longitude":-103.1},{"id":"iem_G_43.190_-103.000_1788044340000","source":"iem","severity":"low","severityValue":25,"timestamp":1788044340000,"latitude":43.19,"longitude":-103},{"id":"iem_G_43.180_-102.990_1788045300000","source":"iem","severity":"low","severityValue":25,"timestamp":1788045300000,"latitude":43.18,"longitude":-102.99},{"id":"iem_G_43.100_-103.050_1788043800000","source":"iem","severity":"low","severityValue":25,"timestamp":1788043800000,"latitude":43.1,"longitude":-103.05},{"id":"iem_G_43.180_-102.990_1788044700000","source":"iem","severity":"low","severityValue":25,"timestamp":1788044700000,"latitude":43.18,"longitude":-102.99},{"id":"iem_G_43.020_-102.510_1788045480000","source":"iem","severity":"low","severityValue":25,"timestamp":1788045480000,"latitude":43.02,"longitude":-102.51}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100, near Rapid City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.