Right now
The most recent data we hold from NOAA arrived 7 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
12 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 16 September 2026 at 23:30 UTC. It is kept here as a record.
No stronger detection stands among the 22 recorded within 20 km of this point since 15 March 2026 — 6 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued September 16 at 3:51PM MDT until September 16 at 5:30PM MDT by NWS Salt Lake City UT
Nearby, since 15 March 2026
- September 17, 2026 · score 28 · 15.5 km
How we know
3 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 | High |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.71/1 |
| Coordinates | 39.4387, -110.8475 |
| Nearest City | Payson (101 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-16T21:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a3429469ec904a4a6a330c4c6955bfb1bc867819.001.1 |
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: 2026-09-16T21:51:00.000Z.
First archived: 2026-09-16T21:53:16.415Z. Material modification: 2026-09-16T22:31:59.669Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-16T23:21:45.305Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
2026-09-16T23:10:18.838Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
2026-09-16T22:53:53.360Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
2026-09-16T22:48:24.518Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
2026-09-16T22:37:28.612Z · data_change
Index 28 → 28; severity high → high; version 5 → 5.
2026-09-16T22:31:59.669Z · data_change
Index 16 → 28; severity medium → high; version 5 → 5.
2026-09-16T22:26:33.712Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
2026-09-16T22:21:05.418Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
2026-09-16T22:04:16.095Z · data_change
Index 16 → 16; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Carbon, UT; Emery, UT |
| Headline | Flood Warning issued September 16 at 3:51PM MDT until September 16 at 5:30PM MDT by NWS Salt Lake City UT |
| Expires | 2026-09-16T17:30:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 1 E Sunnyside |
| Spc County | Carbon |
| Spc State | UT |
| Spc Comments | Trained spotter reported quarter sized hail reported in Sunnyside... UT. (SLC) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 E Sunnyside |
| Iem County | Carbon |
| Iem State | UT |
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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