Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is in it.
4 other detections within 20 km in the last 24 hours, the nearest 9 km from here.
This alert expired on 15 September 2026 at 22:45 UTC. It is kept here as a record.
It is the 31st strongest of the 49 detections recorded within 20 km of this point since 15 July 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 15 at 3:15PM MDT until September 15 at 4:45PM MDT by NWS Salt Lake City UT
Nearby, since 15 July 2026
- July 30, 2026 · score 22 · 8.1 km
- July 29, 2026 · score 22 · 22.1 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 16 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) | 16 / 100 |
| Legacy data-support index | 0.66/1 |
| Coordinates | 37.0683, -111.9483 |
| Nearest City | Cedar City (119 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-15T21:15:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.2f8ce9c87562a372d348df37ec21495e2740f6d3.001.1 |
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: 2026-09-15T21:15:00.000Z.
First archived: 2026-09-15T21:38:45.077Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-15T22:34:49.203Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Kane, UT |
| Headline | Flash Flood Warning issued September 15 at 3:15PM MDT until September 15 at 4:45PM MDT by NWS Salt Lake City UT |
| Expires | 2026-09-15T16:45:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 20 W Big Water |
| Iem County | Kane |
| Iem State | UT |
| Iem Wfo | SLC |
| Iem Remark | Coyote Wash flashing across House Rock Valley Road south of Wire Pass Trailhead. |
| MergedSources | [{"id":"iem_F_37.020_-112.030_1789507140000","source":"iem","severity":"low","severityValue":25,"timestamp":1789507140000,"latitude":37.02,"longitude":-112.03}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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