This alert is in force until 31 August 2026, 03:00 UTC.
It is the 30th strongest of the 177 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued August 30 at 3:26PM MDT until August 30 at 9:00PM MDT by NWS Rapid City SD
Nearby, since 15 March 2026
- August 27, 2026 · score 22 · 0.0 km
- August 12, 2026 · score 22 · 0.0 km
- August 9, 2026 · score 22 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % 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 | 60% |
| Coordinates | 43.9000, -99.4000 |
| Nearest City | Mitchell (112 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T21:26:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Butte, SD; Harding, SD; Lawrence, SD; Meade, SD; Perkins, SD; Crook, WY; Ziebach, SD |
| Headline | Severe Thunderstorm Watch issued August 30 at 3:26PM MDT until August 30 at 9:00PM MDT by NWS Rapid City SD |
| Expires | 2026-08-30T21:00:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3936b1337355fe4ba22477c373a442923f3ca58e.002.1","noaa_urn:oid:2.49.0.1.840.0.3936b1337355fe4ba22477c373a442923f3ca58e.001.1"] |
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 22/100, near Mitchell (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.