This alert expired on 31 August 2026 at 01:00 UTC. It is kept here as a record.
It is the 4th strongest of the 25 detections recorded within 20 km of this point since 3 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 30 at 7:47PM CDT until August 30 at 8:00PM CDT by NWS Aberdeen SD
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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 | 70% |
| Coordinates | 46.2490, -100.4759 |
| Nearest City | Bismarck (67 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-31T00:47:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Corson, SD; Burleigh, ND; Emmons, ND; Morton, ND; Sioux, ND |
| Headline | Severe Thunderstorm Warning issued August 30 at 7:47PM CDT until August 30 at 8:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-08-30T20:00:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b7d1a4e877cf310f6e5de49a38e6207cb5d8105c.001.1","noaa_urn:oid:2.49.0.1.840.0.185f4af28a1f6f8b1cd84ad533fba21c5269af05.001.1"] |
| 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_46.44_-101.37_90","source":"spc","severity":"medium","severityValue":45,"timestamp":1788137587348,"latitude":46.44,"longitude":-101.37},{"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.