This alert expired on 30 August 2026 at 23:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 8 detections recorded within 20 km of this point since 9 June 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 6:18PM CDT until August 30 at 6:30PM CDT by NWS Bismarck ND
Nearby, since 9 June 2026
- August 30, 2026 · score 22 · 1.7 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 61 % 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 | 61% |
| Coordinates | 46.5010, -101.8301 |
| Nearest City | Mandan (81 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-30T23:18:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Adams, ND; Hettinger, ND; Perkins, SD; Grant, ND; Sioux, ND and 3 more areas |
| Headline | Severe Thunderstorm Warning issued August 30 at 6:18PM CDT until August 30 at 6:30PM CDT by NWS Bismarck ND |
| Expires | 2026-08-30T18:30:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3f7ef2b5f4957455d6ee0db1b0d411db8b1f82f3.001.1","noaa_urn:oid:2.49.0.1.840.0.3f7ef2b5f4957455d6ee0db1b0d411db8b1f82f3.001.1","noaa_urn:oid:2.49.0.1.840.0.fba36ec71e60ca20185055502b6ca98dd12e7d79.001.1","noaa_urn:oid:2.49.0.1.840.0.fba36ec71e60ca20185055502b6ca98dd12e7d79.001.1","noaa_urn:oid:2.49.0.1.840.0.95583944599e1611968f6da01aeaea7cca553a73.001.1","noaa_urn:oid:2.49.0.1.840.0.95583944599e1611968f6da01aeaea7cca553a73.001.1","noaa_urn:oid:2.49.0.1.840.0.ca0fc2f92508cecacf2e7c0759144ea11fa6fdb7.001.1","noaa_urn:oid:2.49.0.1.840.0.ca0fc2f92508cecacf2e7c0759144ea11fa6fdb7.001.1","noaa_urn:oid:2.49.0.1.840.0.efc541eccf65aa4ea77c6818d867b22cde52ea3f.001.1","noaa_urn:oid:2.49.0.1.840.0.efc541eccf65aa4ea77c6818d867b22cde52ea3f.001.1","noaa_urn:oid:2.49.0.1.840.0.60ac2e7828e53ba44e8ba2c2b47157f8862e2d82.001.1","noaa_urn:oid:2.49.0.1.840.0.60ac2e7828e53ba44e8ba2c2b47157f8862e2d82.001.1"] |
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 Mandan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.