Right now
The most recent data we hold from NOAA arrived 44 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 3 km from here.
This alert expired on 25 September 2026 at 02:30 UTC. It is kept here as a record.
It is one of only 4 we have recorded within 20 km of this point since 8 September 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 24 at 4:32PM PDT until September 24 at 7:30PM PDT by NWS San Diego CA
Urban PEI: 1,888,542 within a heuristic 50 km radius; not unique people.
Nearby, since 8 September 2026
- September 11, 2026 · 25.4 km
- September 10, 2026 · 25.4 km
- September 8, 2026 · 25.4 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 34.0345, -116.9718 |
| Nearest City | Yucaipa (6 km) |
| Urban exposure index (PEI) | 1.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-24T23:32:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b91ccc75f94326dc046c7b15da700e5e63c04aa7.001.1 |
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: 2026-09-24T23:32:00.000Z.
First archived: 2026-09-25T01:16:41.303Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Riverside, CA; San Bernardino, CA |
| Headline | Flash Flood Warning issued September 24 at 4:32PM PDT until September 24 at 7:30PM PDT by NWS San Diego CA |
| Expires | 2026-09-24T19:30:00-07:00 |
| SenderName | NWS San Diego CA |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 3 E Joshua Tree |
| Iem County | San Bernardino |
| Iem State | CA |
| Iem Wfo | VEF |
| Iem Remark | CHP report of closing lanes on SR62 due to debris from flash flooding. |
| MergedSources | [{"id":"iem_H_34.040_-116.940_1790293620000","source":"iem","severity":"low","severityValue":25,"timestamp":1790293620000,"latitude":34.04,"longitude":-116.94},{"id":"iem_x_34.060_-116.970_1790289120000","source":"iem","severity":"low","severityValue":25,"timestamp":1790289120000,"latitude":34.06,"longitude":-116.97},{"id":"iem_F_34.140_-116.270_1790288640000","source":"iem","severity":"low","severityValue":25,"timestamp":1790288640000,"latitude":34.14,"longitude":-116.27}] |
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.
Review the area, threshold and delivery channel in your account.
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