Severe Weather near Rancho Santa Margarita
Right now
The most recent data we hold from HEAT GOV arrived 4 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert is in force until 8 September 2026, 05:15 UTC.
It is the only one we have recorded within 20 km of this point since 8 September 2026.
What the source measured
HEAT GOV reported: * WHAT...High temperatures in the mid to upper 90s expected and overnight lows in the mid-70s. * WHERE...Orange County Inland Areas and Santa Ana Mountains and Foothills. * WHEN...From 10 AM Tuesday to 8 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETA...
An estimated 5,411,071 people live within 50 km of this point.
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 | 33.6568, -117.5468 |
| Nearest City | Rancho Santa Margarita (5 km) |
| Population Exposed | 5.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-08T17:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-08T10:00:00-07:00 |
| Expires | 2026-09-07T22:15:00-07:00 |
| AreaDesc | Santa Ana Mountains and Foothills; Orange County Inland |
| SenderName | NWS San Diego CA |
| ZonesUsedForCentroid | 2 |
| ZoneCount | 2 |
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.
Want to know when something happens near Rancho Santa Margarita?
Calamity.live data shows a weather event with CalamityScore 46/100, near Rancho Santa Margarita (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.