Right now
The most recent data we hold from NOAA arrived 12 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 05:15 UTC. It is kept here as a record.
No stronger detection stands among the 10 recorded within 20 km of this point since 13 May 2026 — 6 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 10:24PM MDT until September 6 at 11:15PM MDT by NWS Great Falls MT
Nearby, since 13 May 2026
- July 9, 2026 · 11.8 km
How we know
3 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 | 0.71/1 |
| Coordinates | 47.6337, -108.9923 |
| Nearest City | Great Falls (174 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-07T04:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b21f3298c78d5b4c9d06e70d432ab86444f8d3eb.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: 2026-09-07T04:24:00.000Z.
First archived: 2026-09-07T04:26:58.476Z. 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 | Fergus, MT; Blaine, MT |
| Headline | Severe Thunderstorm Warning issued September 6 at 10:24PM MDT until September 6 at 11:15PM MDT by NWS Great Falls MT |
| Expires | 2026-09-06T23:15:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b21f3298c78d5b4c9d06e70d432ab86444f8d3eb.001.1","noaa_urn:oid:2.49.0.1.840.0.26dddc195cb022c940e3588b1acf2d7fcb04d7c0.001.1","noaa_urn:oid:2.49.0.1.840.0.107380aa59532c7cd5deb7ca94a6a5a7afb84a82.001.1","noaa_urn:oid:2.49.0.1.840.0.d66a35bcd3811c022553a436cdcd7bffe6e6bdc0.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | 6 E Lewistown |
| Spc County | Fergus |
| Spc State | MT |
| Spc Comments | Estimated from social media photo from public. (TFX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 8 E Lewistown |
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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