This alert expired on 31 August 2026 at 01:34 UTC. It is kept here as a record.
No stronger detection stands among the 27 recorded within 20 km of this point since 4 April 2026 — 19 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 8:24PM CDT until August 30 at 8:30PM CDT by NWS Bismarck ND
Nearby, since 4 April 2026
- August 9, 2026 · score 22 · 25.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 66 % 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 | 66% |
| Coordinates | 46.0546, -100.2108 |
| Nearest City | Bismarck (95 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-31T01:24:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burleigh, ND; Emmons, ND; Campbell, SD; Corson, SD; Dewey, SD; Walworth, SD |
| Headline | Severe Thunderstorm Warning issued August 30 at 8:24PM CDT until August 30 at 8:30PM CDT by NWS Bismarck ND |
| Expires | 2026-08-30T20:34:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7dcf2bf7360750a78674dccd2f71c184c057e56c.001.1","noaa_urn:oid:2.49.0.1.840.0.edcbc242546c322b904b294e025a6f64c6e7e13b.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 65 |
| Spc Location | 8 N Selfridge |
| Spc County | Sioux |
| Spc State | ND |
| Spc Comments | Mesonet station TTKN8 Tatanka Prairie. (BIS) |
| MergedSources | [{"id":"spc_wind_46.16_-100.90_94","source":"spc","severity":"medium","severityValue":45,"timestamp":1788135900000,"latitude":46.16,"longitude":-100.9}] |
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 Bismarck (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.