This alert expired on 28 June 2026 at 04:15 UTC. It is kept here as a record.
No stronger detection stands among the 97 recorded within 20 km of this point since 4 April 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 27 at 10:57PM CDT until June 27 at 11:15PM CDT by NWS Bismarck ND
An estimated 96,474 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 29, 2026 · score 63 · 8.3 km
- June 30, 2026 · score 45 · 18.6 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 63 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 63 / 100 |
| Our confidence | 90% |
| Coordinates | 47.0271, -100.7786 |
| Nearest City | Mandan (23 km) |
| Population Exposed | 96.5K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-06-28T03:57:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Burleigh, ND |
| Headline | Tornado Warning issued June 27 at 10:57PM CDT until June 27 at 11:15PM CDT by NWS Bismarck ND |
| Expires | 2026-06-27T23:15:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | MPH |
| Iem City | 5 SW Judson |
| Iem County | Morton |
| Iem State | ND |
| Iem Wfo | BIS |
| Iem Remark | 61 MPH wind gust at 10M recorded at New Salem 6SE NDAWN. |
| MergedSources | [{"id":"iem_G_46.460_-101.220_1782617040000","source":"iem","severity":"low","severityValue":25,"timestamp":1782617040000,"latitude":46.46,"longitude":-101.22},{"id":"iem_G_46.770_-101.340_1782616920000","source":"iem","severity":"low","severityValue":25,"timestamp":1782616920000,"latitude":46.77,"longitude":-101.34}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 63/100, near Mandan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.