This alert expired on 29 August 2026 at 23:30 UTC. It is kept here as a record.
It is the 95th strongest of the 188 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 5:12PM MDT until August 29 at 5:30PM MDT by NWS Cheyenne WY
Nearby, since 22 March 2026
- August 12, 2026 · score 22 · 8.7 km
How we know
Confirmed by 9 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 | 42.9654, -102.8790 |
| Nearest City | Rapid City (127 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-29T23:12:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Dawes, NE; Fall River, SD; Oglala Lakota, SD |
| Headline | Severe Thunderstorm Warning issued August 29 at 5:12PM MDT until August 29 at 5:30PM MDT by NWS Cheyenne WY |
| Expires | 2026-08-29T17:30:00-06:00 |
| SenderName | NWS Cheyenne WY |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2cf7c304bc8861b229003c2d1c8a184b758279f4.001.1","noaa_urn:oid:2.49.0.1.840.0.ae7e03424705f37ab23f08cea00bd6c0424de9e7.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 62 |
| Spc Location | 12 E Oelrichs |
| Spc County | Fall River |
| Spc State | SD |
| Spc Comments | (UNR) |
| MergedSources | [{"id":"spc_wind_42.92_-103.71_25","source":"spc","severity":"medium","severityValue":45,"timestamp":1788042240000,"latitude":42.92,"longitude":-103.71},{"id":"spc_wind_42.75_-103.31_30","source":"spc","severity":"medium","severityValue":45,"timestamp":1788043080000,"latitude":42.75,"longitude":-103.31},{"id":"spc_wind_43.04_-103.35_31","source":"spc","severity":"medium","severityValue":45,"timestamp":1788043200000,"latitude":43.04,"longitude":-103.35},{"id":"spc_wind_42.83_-103.10_32","source":"spc","severity":"medium","severityValue":45,"timestamp":1788043440000,"latitude":42.83,"longitude":-103.1},{"id":"spc_wind_43.10_-103.05_34","source":"spc","severity":"medium","severityValue":45,"timestamp":1788043800000,"latitude":43.1,"longitude":-103.05},{"id":"spc_wind_42.83_-103.10_35","source":"spc","severity":"medium","severityValue":45,"timestamp":1788043980000,"latitude":42.83,"longitude":-103.1},{"id":"spc_wind_43.10_-103.05_36","source":"spc","severity":"medium","severityValue":45,"timestamp":1788044100000,"latitude":43.1,"longitude":-103.05},{"id":"spc_wind_43.19_-103.00_37","source":"spc","severity":"medium","severityValue":45,"timestamp":1788044340000,"latitude":43.19,"longitude":-103}] |
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.