Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
86 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 18 September 2026 at 20:15 UTC. It is kept here as a record.
No stronger detection stands among the 114 recorded within 20 km of this point since 2 April 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued September 18 at 1:44PM MDT until September 18 at 2:15PM MDT by NWS Salt Lake City UT
Urban PEI: 1,374,620 within a heuristic 50 km radius; not unique people.
Nearby, since 2 April 2026
- September 19, 2026 · score 58 · 5.9 km
- September 19, 2026 · score 58 · 7.0 km
- September 18, 2026 · score 76 · 7.5 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 76 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 | Critical |
| Calamity Score (ours) | 76 / 100 |
| Legacy data-support index | 0.85/1 |
| Coordinates | 41.0300, -111.8660 |
| Nearest City | Farmington (6 km) |
| Urban exposure index (PEI) | 1.4M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-09-18T19:44:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.d55a58719984a9ed89995e0a803c9f333507b560.001.1 |
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: 2026-09-18T19:44:00.000Z.
First archived: 2026-09-18T19:47:07.073Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T19:52:54.860Z · data_change
Index 76 → 76; severity critical → critical; version 5 → 5.
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Davis, UT; Morgan, UT; Weber, UT |
| Headline | Tornado Warning issued September 18 at 1:44PM MDT until September 18 at 2:15PM MDT by NWS Salt Lake City UT |
| Expires | 2026-09-18T14:15:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| Iem TypeSummary | E |
| Iem City | 1 W Pleasant Grove |
| Iem County | Utah |
| Iem State | UT |
| Iem Wfo | SLC |
| Iem Remark | Public video shows water flowing over the road along 1300 W and State St in Pleasant Grove. |
| MergedSources | [{"id":"iem_H_40.670_-111.840_1789742160000","source":"iem","severity":"low","severityValue":25,"timestamp":1789742160000,"latitude":40.67,"longitude":-111.84},{"id":"iem_E_40.370_-111.760_1789740000000","source":"iem","severity":"low","severityValue":25,"timestamp":1789740000000,"latitude":40.37,"longitude":-111.76}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 near Farmington?