Right now
The most recent data we hold from NOAA arrived 8 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 7 September 2026 at 02:00 UTC. It is kept here as a record.
No stronger detection stands among the 33 recorded within 20 km of this point since 8 March 2026 — 19 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 6 at 7:13PM MDT until September 6 at 8:00PM MDT by NWS Great Falls MT
Urban PEI: 59,638 within a heuristic 50 km radius; not unique people.
Nearby, since 8 March 2026
- May 13, 2026 · 7.7 km
- September 7, 2026 · score 32 · 12.1 km
- September 14, 2026 · 21.4 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 | 0.80/1 |
| Coordinates | 47.2617, -110.8911 |
| Nearest City | Great Falls (41 km) |
| Urban exposure index (PEI) | 59.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-07T01:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4af26e2a71059fe0768c5aa7fd907c916863fd11.001.1 |
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: 2026-09-07T01:13:00.000Z.
First archived: 2026-09-07T01:17:38.543Z. 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 | Cascade, MT; Lewis and Clark, MT; Chouteau, MT; Judith Basin, MT; Chouteau, MT; Fergus, MT and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 6 at 7:13PM MDT until September 6 at 8:00PM MDT by NWS Great Falls MT |
| Expires | 2026-09-06T20:00:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4af26e2a71059fe0768c5aa7fd907c916863fd11.001.1","noaa_urn:oid:2.49.0.1.840.0.4171eb3faa74ef5dafcf12bebbaa61ae69f0989e.001.1","noaa_urn:oid:2.49.0.1.840.0.21391a3c60e2121571eba9b248634762bf10a88f.001.1","noaa_urn:oid:2.49.0.1.840.0.dcf61add88e988bd52c9b5125ddba60676a04c08.001.1"] |
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.
Want to know when something happens in this area?