Reported by SPC today.
It is the 30th strongest of the 248 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 19 August 2026.
What the source measured
SPC reported: Wind 60 kt near 1 W Box Elder, Pennington, SD. (UNR)
An estimated 73,569 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 31, 2026 · score 39 · 8.1 km
- June 4, 2026 · score 39 · 13.6 km
- June 3, 2026 · score 39 · 22.4 km
How we know
Confirmed by 9 independent sources, including SPC.
Our own score for this event is 32 out of 100, at 85 % 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) | 32 / 100 |
| Our confidence | 85% |
| Coordinates | 44.1200, -103.0900 |
| Nearest City | Rapid City (12 km) |
| Population Exposed | 73.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T22:59:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | wind |
| Speed | 60 |
| Location | 1 W Box Elder |
| County | Pennington |
| State | SD |
| Comments | (UNR) |
| Iem TypeSummary | G |
| Iem Magnitude | 55 |
| Iem Unit | mph |
| Iem City | Rapid City Arpt |
| Iem County | Pennington |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_44.120_-102.930_1788131160000","source":"iem","severity":"low","severityValue":25,"timestamp":1788131160000,"latitude":44.12,"longitude":-102.93},{"id":"iem_G_44.120_-102.930_1788130560000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130560000,"latitude":44.12,"longitude":-102.93},{"id":"iem_G_44.120_-103.090_1788130440000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130440000,"latitude":44.12,"longitude":-103.09},{"id":"iem_G_44.240_-103.250_1788130440000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130440000,"latitude":44.24,"longitude":-103.25},{"id":"iem_G_44.120_-103.090_1788130740000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130740000,"latitude":44.12,"longitude":-103.09},{"id":"iem_G_44.240_-103.250_1788129360000","source":"iem","severity":"low","severityValue":25,"timestamp":1788129360000,"latitude":44.24,"longitude":-103.25},{"id":"iem_G_44.150_-103.100_1788130920000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130920000,"latitude":44.15,"longitude":-103.1},{"id":"iem_G_44.050_-103.060_1788130740000","source":"iem","severity":"low","severityValue":25,"timestamp":1788130740000,"latitude":44.05,"longitude":-103.06}] |
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 32/100, near Rapid City (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.