This alert expired on 9 August 2026 at 05:00 UTC. It is kept here as a record.
No stronger detection stands among the 30 recorded within 20 km of this point since 5 April 2026 — 21 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 8 at 11:43PM CDT until August 9 at 12:00AM CDT by NWS Bismarck ND
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 67 % 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 | 67% |
| Coordinates | 45.8758, -100.0063 |
| Nearest City | Bismarck (120 km) |
| Impact Tier | minor |
| Timestamp | 2026-08-09T04:43:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Emmons, ND; Campbell, SD; Campbell, SD; McPherson, SD |
| Headline | Severe Thunderstorm Warning issued August 8 at 11:43PM CDT until August 9 at 12:00AM CDT by NWS Bismarck ND |
| Expires | 2026-08-09T00:00:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.affff7b8a8ef887e7179609408d9e10e1c10f3f4.001.1","noaa_urn:oid:2.49.0.1.840.0.3f65bc102ab2b5554e8e468c0524f907ccb54723.001.1","noaa_urn:oid:2.49.0.1.840.0.8ba1377d1a181199bb3b058f30b00ad711979c88.001.1","noaa_urn:oid:2.49.0.1.840.0.f0b3c13dfb42e75e21728f8d4795f928169433d0.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 4 W Strasburg |
| Iem County | Emmons |
| Iem State | ND |
| Iem Wfo | BIS |
| Iem Remark | Broadcast media forwarded a picture of a hail stone, next to a quarter. |
| MergedSources | [{"id":"iem_H_46.130_-100.240_1786237800000","source":"iem","severity":"low","severityValue":25,"timestamp":1786237800000,"latitude":46.13,"longitude":-100.24}] |
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.