Right now
The most recent data we hold from NOAA arrived 4 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, 17 km from here.
This alert expired on 15 September 2026 at 19:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 9 detections recorded within 20 km of this point since 22 April 2026. The last comparable one was on 13 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 15 at 1:12PM MDT until September 15 at 1:45PM MDT by NWS Grand Junction CO
Urban PEI: 19,062 within a heuristic 50 km radius; not unique people.
Nearby, since 22 April 2026
- July 21, 2026 · score 28 · 14.6 km
- July 25, 2026 · score 28 · 18.5 km
- July 29, 2026 · score 34 · 20.1 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.87/1 |
| Coordinates | 38.2380, -108.1720 |
| Nearest City | Montrose (37 km) |
| Urban exposure index (PEI) | 19.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-15T19:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0807b38a55515fed269c0aa1a8c2978086f6ecde.001.1 |
Physical priority index · v5. 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: 2026-09-15T19:12:00.000Z.
First archived: 2026-09-15T19:14:44.906Z. 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 | Montrose, CO; Ouray, CO; San Miguel, CO |
| Headline | Severe Thunderstorm Warning issued September 15 at 1:12PM MDT until September 15 at 1:45PM MDT by NWS Grand Junction CO |
| Expires | 2026-09-15T13:45:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 0.8 |
| Iem Unit | Inch |
| Iem City | 9 SW Maher |
| Iem County | Montrose |
| Iem State | CO |
| Iem Wfo | GJT |
| Iem Remark | CO-OP Observer station BKCC2 Black Canyon of the Gunnison. |
| MergedSources | [{"id":"iem_R_38.440_-107.930_1789480800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789480800000,"latitude":38.44,"longitude":-107.93},{"id":"iem_R_38.220_-107.810_1789480800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789480800000,"latitude":38.22,"longitude":-107.81},{"id":"iem_R_38.670_-107.660_1789479000000","source":"iem","severity":"low","severityValue":25,"timestamp":1789479000000,"latitude":38.67,"longitude":-107.66},{"id":"iem_R_38.790_-108.070_1789484100000","source":"iem","severity":"low","severityValue":25,"timestamp":1789484100000,"latitude":38.79,"longitude":-108.07},{"id":"iem_R_38.550_-107.690_1789480800000","source":"iem","severity":"low","severityValue":25,"timestamp":1789480800000,"latitude":38.55,"longitude":-107.69}] |
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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