Severe Weather near Rancho Santa Margarita
Right now
The most recent data we hold from HEAT GOV arrived 88 minutes ago, and this point is in it.
2 other detections within 20 km in the last 24 hours, the nearest 7 km from here.
This alert is in force until 9 September 2026, 22:30 UTC.
It is one of only 3 we have recorded within 20 km of this point since 8 September 2026. The last comparable one was on 8 September 2026. 2 more were recorded here in the fortnight before it.
What the source measured
HEAT GOV reported: * WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the 90s to near 100 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the mid 80s to mid 90s expected. * WHERE...Santa Ana Mountains and Foothills. * WHEN...For the E...
An estimated 4,621,238 people live within 50 km of this point.
Nearby, since 8 September 2026
- September 8, 2026 · score 46 · 6.6 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 69 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. 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 |
| Our confidence | 69% |
| Coordinates | 33.6289, -117.4832 |
| Nearest City | Rancho Santa Margarita (11 km) |
| Population Exposed | 4.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-10T03:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-09T20:00:00-07:00 |
| Expires | 2026-09-09T15:30:00-07:00 |
| AreaDesc | Santa Ana Mountains and Foothills |
| SenderName | NWS San Diego CA |
| ZonesUsedForCentroid | 1 |
| ZoneCount | 1 |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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