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.
2 other detections within 20 km in the last 24 hours, the nearest 10 km from here.
This alert expired on 29 September 2026 at 02:45 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 21 July 2026. The last comparable one was on 28 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 28 at 5:54PM PDT until September 28 at 7:45PM PDT by NWS Las Vegas NV
Nearby, since 21 July 2026
- July 21, 2026 · 12.5 km
- September 28, 2026 · score 16 · 19.4 km
- August 10, 2026 · 21.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.61/1 |
| Coordinates | 35.9446, -113.8960 |
| Nearest City | Boulder City (84 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-29T00:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.70f936eee0ad7b45a8abb02fde404102a4b4ccf8.001.1 |
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: 2026-09-29T00:54:00.000Z.
First archived: 2026-09-29T00:48:54.988Z. Material modification: 2026-09-29T00:59:41.194Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
1 retained revision changed source fields this page does not show; the index, severity and version stayed the same.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| MessageId | urn:oid:2.49.0.1.840.0.70f936eee0ad7b45a8abb02fde404102a4b4ccf8.001.1 |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Mohave, AZ; Kane, UT; Washington, UT; Washington, UT and 4 more areas |
| Headline | Flash Flood Warning issued September 28 at 5:54PM PDT until September 28 at 7:45PM PDT by NWS Las Vegas NV |
| Expires | 2026-09-28T19:45:00-07:00 |
| SenderName | NWS Las Vegas NV |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0e17d6dc1946708db02546392101cb05d20d1159.001.1","noaa_urn:oid:2.49.0.1.840.0.b8435525cf26ade679837ff1af7328075cb4bc94.001.1","noaa_urn:oid:2.49.0.1.840.0.07bb934911c3ff02f6d3df9e972530a92b2dc07d.001.1","noaa_urn:oid:2.49.0.1.840.0.6386d960aa5c61aaaa3767bd4951698e2dd227a0.001.1","noaa_urn:oid:2.49.0.1.840.0.44dbfe4c32d87a28e5e4f77aa46fa640695c03ec.001.1","noaa_urn:oid:2.49.0.1.840.0.63655b547d0b593a6beba839310ccd282f054867.001.1","noaa_urn:oid:2.49.0.1.840.0.d1978efba89e86883aa4af837827ef2184420aff.001.1","noaa_urn:oid:2.49.0.1.840.0.4e4051ce9793a9e9e1bd964fe5d3d1cc19287c79.001.1"] |
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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