Right now
The most recent data we hold from NOAA arrived 63 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 16 September 2026 at 01:15 UTC. It is kept here as a record.
It is the 4th strongest of the 5 detections recorded within 20 km of this point since 18 July 2026. The last comparable one was on 13 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 15 at 6:52PM MDT until September 15 at 7:15PM MDT by NWS Grand Junction CO
Urban PEI: 80,247 within a heuristic 50 km radius; not unique people.
Nearby, since 18 July 2026
- August 13, 2026 · score 39 · 14.2 km
- July 27, 2026 · score 34 · 18.4 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
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 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) | 32 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.4220, -108.5000 |
| Nearest City | Clifton (37 km) |
| Urban exposure index (PEI) | 80.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-16T00:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.f128a886574e5ea88775535ff930828ec5090d4f.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: 2026-09-16T00:52:00.000Z.
First archived: 2026-09-16T00:57:54.449Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-16T01:08:53.255Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
2026-09-16T01:03:30.250Z · data_change
Index 32 → 32; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Garfield, CO; Mesa, CO |
| Headline | Severe Thunderstorm Warning issued September 15 at 6:52PM MDT until September 15 at 7:15PM MDT by NWS Grand Junction CO |
| Expires | 2026-09-15T19:15:00-06:00 |
| SenderName | NWS Grand Junction CO |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 5 NW Mack |
| Spc County | Mesa |
| Spc State | CO |
| Spc Comments | (GJT) |
| Iem TypeSummary | F |
| Iem City | 6 NW Mack |
| Iem County | Mesa |
| Iem State | CO |
| Iem Wfo | GJT |
| Iem Remark | Flooded house and people stranded on roof. |
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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