Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 2 km from here.
This alert expired on 5 September 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 15 recorded within 20 km of this point since 3 April 2026 — 2 others scored the same. The last comparable one was on 31 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 5 at 5:21PM CDT until September 5 at 6:00PM CDT by NWS Bismarck ND
Nearby, since 3 April 2026
- September 5, 2026 · score 28 · 2.4 km
- July 7, 2026 · score 16 · 20.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 71% |
| Coordinates | 45.9089, -100.5992 |
| Nearest City | Bismarck (101 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-05T22:21:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6b123abedb150ae8af29c7ca60b076ab6eeab901.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Emmons, ND; Sioux, ND; Corson, SD; Dewey, SD |
| Headline | Severe Thunderstorm Warning issued September 5 at 5:21PM CDT until September 5 at 6:00PM CDT by NWS Bismarck ND |
| Expires | 2026-09-05T18:00:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6b123abedb150ae8af29c7ca60b076ab6eeab901.001.1","noaa_urn:oid:2.49.0.1.840.0.d4434cb548f98947ef6bc12610641d5ca39c42b6.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | 4 N Klein Ranch |
| Spc County | Corson |
| Spc State | SD |
| Spc Comments | Windshield damaged. (ABR) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 4 N Klein Ranch |
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 8 March 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.