Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
6 other detections within 20 km in the last 24 hours, the nearest 2 km from here.
This alert expired on 14 September 2026 at 03:45 UTC. It is kept here as a record.
No stronger detection stands among the 19 recorded within 20 km of this point since 18 March 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 13 at 9:30PM MDT until September 13 at 9:45PM MDT by NWS Great Falls MT
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 | 0.66/1 |
| Coordinates | 47.5305, -110.0948 |
| Nearest City | Great Falls (91 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-14T03:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.c2fa77061c56d4786c5a3a8af635f138a2f2b8d7.001.1 |
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: 2026-09-14T03:30:00.000Z.
First archived: 2026-09-14T03:33:36.874Z. 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 | Chouteau, MT; Fergus, MT; Chouteau, MT; Judith Basin, MT |
| Headline | Severe Thunderstorm Warning issued September 13 at 9:30PM MDT until September 13 at 9:45PM MDT by NWS Great Falls MT |
| Expires | 2026-09-13T21:45:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c2fa77061c56d4786c5a3a8af635f138a2f2b8d7.001.1","noaa_urn:oid:2.49.0.1.840.0.c29066ea5581f6fdac0aef4fee0707610c4ef99a.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 3 SSE Raynesford |
| Spc County | Judith Basin |
| Spc State | MT |
| Spc Comments | Time estimated from radar. (TFX) |
| MergedSources | [{"id":"spc_hail_47.23_-110.71_29","source":"spc","severity":"high","severityValue":65,"timestamp":1789344600000,"latitude":47.23,"longitude":-110.71}] |
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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