Right now
The most recent data we hold from NOAA arrived 56 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 19 km from here.
This alert expired on 7 September 2026 at 01:00 UTC. It is kept here as a record.
No stronger detection stands among the 47 recorded within 20 km of this point since 8 March 2026 — 42 others scored the same. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 6 at 6:37PM MDT until September 6 at 7:00PM MDT by NWS Great Falls MT
Urban PEI: 59,638 within a heuristic 50 km radius; not unique people.
Nearby, since 8 March 2026
- August 27, 2026 · 9.0 km
- August 28, 2026 · 15.2 km
- May 13, 2026 · 17.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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 | Medium |
| Calamity Score (ours) | 32 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 47.3353, -111.1028 |
| Nearest City | Great Falls (24 km) |
| Urban exposure index (PEI) | 59.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-07T00:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.96724142fb7ccb13884feac5c8e7a8e240d5147b.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: 2026-09-07T00:37:00.000Z.
First archived: 2026-09-07T00:41:00.596Z. 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 | Lewis and Clark, MT; Chouteau, MT; Fergus, MT; Judith Basin, MT |
| Headline | Severe Thunderstorm Warning issued September 6 at 6:37PM MDT until September 6 at 7:00PM MDT by NWS Great Falls MT |
| Expires | 2026-09-06T19:00:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.96724142fb7ccb13884feac5c8e7a8e240d5147b.001.1","noaa_urn:oid:2.49.0.1.840.0.383d1ff7bce78db04c13f5137c4da8a4125852ae.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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