This alert expired on 30 August 2026 at 22:45 UTC. It is kept here as a record.
It is the 26th strongest of the 35 detections recorded within 20 km of this point since 3 April 2026. The last comparable one was on 15 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 3:43PM MDT until August 30 at 4:45PM MDT by NWS Rapid City SD
An estimated 23,765 people live within 50 km of this point.
Nearby, since 3 April 2026
- June 30, 2026 · score 40 · 9.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 80 % 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) | 34 / 100 |
| Our confidence | 80% |
| Coordinates | 46.5375, -102.8753 |
| Nearest City | Dickinson (39 km) |
| Population Exposed | 23.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T21:43:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Harding, SD; Perkins, SD; Dunn, ND; Mercer, ND; Morton, ND; Stark, ND; Butte, SD; Harding, SD and 1 more areas |
| Headline | Severe Thunderstorm Warning issued August 30 at 3:43PM MDT until August 30 at 4:45PM MDT by NWS Rapid City SD |
| Expires | 2026-08-30T16:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8ccbf8e9c843ff3201553c02651d59b0b636f7dc.001.1","noaa_urn:oid:2.49.0.1.840.0.611350b0e03b3a9fcd7081b6b029a08f15ac8553.001.1","noaa_urn:oid:2.49.0.1.840.0.9636c5ed0a462f070ae7565f8c90b11f6ecbdbb4.001.1","noaa_urn:oid:2.49.0.1.840.0.df0da26742629dcab727b684f100da4983f29767.002.1"] |
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 34/100, near Dickinson (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.