Right now
The most recent data we hold from HEAT GOV arrived 32 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 5 September 2026 at 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 12 recorded within 20 km of this point since 28 April 2026 — 5 others scored the same. The last comparable one was on 4 September 2026.
What the source measured
HEAT GOV reported: * WHAT...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. * WHERE...Portions of Puerto Rico and Virgin Islands. * WHEN...From 10 AM this morning to 5 PM AST this afternoon. * IMPACTS...High temperatures or elev...
An estimated 1,338,231 people live within 50 km of this point.
Nearby, since 28 April 2026
- September 4, 2026 · score 46 · 0.0 km
- September 3, 2026 · score 46 · 0.0 km
- September 2, 2026 · score 46 · 0.0 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 70 % 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 | 70% |
| Coordinates | 18.0799, -66.1773 |
| Nearest City | Cayey (3 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-05T14:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-05T10:00:00-04:00 |
| Expires | 2026-09-05T17:00:00-04:00 |
| AreaDesc | San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez and Vicinity; Southwest; Culebra; Vieques; St.Thomas...St. John.. and Adjacent Islands; St Croix |
| SenderName | NWS San Juan PR |
| ZonesUsedForCentroid | 8 |
| ZoneCount | 15 |
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 Cayey?
Calamity.live data shows a weather event with CalamityScore 46/100, near Cayey (Puerto Rico), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.