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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 6 September 2026 at 00:15 UTC. It is kept here as a record.
No stronger detection stands among the 81 recorded within 20 km of this point since 14 April 2026 — 69 others scored the same. The last comparable one was on 5 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 5 at 7:02PM CDT until September 5 at 7:15PM CDT by NWS Bismarck ND
Nearby, since 14 April 2026
- September 5, 2026 · score 16 · 1.9 km
- September 6, 2026 · score 28 · 14.5 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.65/1 |
| Coordinates | 48.8770, -99.4880 |
| Nearest City | Brandon (113 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-06T00:02:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e115501a958cbee7605bbbfdb2161e710f42a798.001.1 |
Physical priority index · v4 (historical). Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-06T00:02:00.000Z.
First archived: 2026-09-06T00:05:54.702Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Rolette, ND; Towner, ND |
| Headline | Severe Thunderstorm Warning issued September 5 at 7:02PM CDT until September 5 at 7:15PM CDT by NWS Bismarck ND |
| Expires | 2026-09-05T19:15:00-05:00 |
| SenderName | NWS Bismarck ND |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e115501a958cbee7605bbbfdb2161e710f42a798.001.1","noaa_urn:oid:2.49.0.1.840.0.341267be1b9d058f08169b17aa0be4ef0219d5bd.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 2 SE Saint John |
| Spc County | Rolette |
| Spc State | ND |
| Spc Comments | Trained spotter called in a report of quarter size hail. (BIS) |
| MergedSources | [{"id":"spc_hail_48.91_-99.68_186","source":"spc","severity":"high","severityValue":65,"timestamp":1788652956517,"latitude":48.91,"longitude":-99.68}] |
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.
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