This alert expired on 31 August 2026 at 00:00 UTC. It is kept here as a record.
It is the 11th strongest of the 14 detections recorded within 20 km of this point since 19 July 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 6:49PM CDT until August 30 at 7:00PM CDT by NWS Aberdeen SD
Nearby, since 19 July 2026
- August 30, 2026 · score 22 · 13.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 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) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 46.3893, -101.5859 |
| Nearest City | Mandan (72 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T23:49:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Corson, SD; Burleigh, ND; Emmons, ND; Grant, ND; Morton, ND; Oliver, ND; Sioux, ND; Grant, ND; Morton, ND and 1 more areas |
| Headline | Severe Thunderstorm Warning issued August 30 at 6:49PM CDT until August 30 at 7:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T19:00:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.111113b04dc5985783d0e4c98c4322bcf02794ce.001.1","noaa_urn:oid:2.49.0.1.840.0.ec2a63c091ad6ae98a3d1f6acd7e34b65c677096.001.1","noaa_urn:oid:2.49.0.1.840.0.18b5a5971f46a0e6abc5814f18927ae544fac0e2.002.1","noaa_urn:oid:2.49.0.1.840.0.18b5a5971f46a0e6abc5814f18927ae544fac0e2.002.1","noaa_urn:oid:2.49.0.1.840.0.95583944599e1611968f6da01aeaea7cca553a73.001.1","noaa_urn:oid:2.49.0.1.840.0.95583944599e1611968f6da01aeaea7cca553a73.001.1"] |
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 16/100, near Mandan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.