This alert expired on 31 August 2026 at 00:45 UTC. It is kept here as a record.
It is the 10th strongest of the 12 detections recorded within 20 km of this point since 9 July 2026. The last comparable one was on 15 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 6:42PM CDT until August 30 at 7:45PM CDT by NWS Bismarck ND
Nearby, since 9 July 2026
- August 30, 2026 · score 22 · 8.9 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 | 46.3015, -101.5796 |
| Nearest City | Mandan (79 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T23:42:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burleigh, ND; Emmons, ND; Grant, ND; Morton, ND; Oliver, ND; Sioux, ND; Corson, SD; Grant, ND; Morton, ND and 1 more areas |
| Headline | Severe Thunderstorm Warning issued August 30 at 6:42PM CDT until August 30 at 7:45PM CDT by NWS Bismarck ND |
| Expires | 2026-08-30T19:45:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ec2a63c091ad6ae98a3d1f6acd7e34b65c677096.001.1","noaa_urn:oid:2.49.0.1.840.0.e2a0c6c64f86623d20f301f1ac8f9bad4da194d8.001.1","noaa_urn:oid:2.49.0.1.840.0.e2a0c6c64f86623d20f301f1ac8f9bad4da194d8.001.1","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.