This alert is in force until 6 September 2026, 00:00 UTC.
It is the 13th strongest of the 27 detections recorded within 20 km of this point since 25 May 2026. The last comparable one was on 4 September 2026.
What the source measured
HEAT GOV reported: * WHAT...For today's Heat Advisory, heat index values around 108. For Saturday's Heat Advisory, heat index values up to 110 possible. * WHERE...Chesterfield, Northern Lancaster, and Southern Lancaster Counties. * WHEN...For today's Heat Advisory, until 8 PM EDT this evening. For Saturday's Heat...
An estimated 214,819 people live within 50 km of this point.
Nearby, since 25 May 2026
- September 4, 2026 · score 37 · 0.0 km
- July 10, 2026 · score 52 · 10.4 km
- June 28, 2026 · score 43 · 13.5 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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) | 37 / 100 |
| Our confidence | 69% |
| Coordinates | 34.7358, -80.5775 |
| Nearest City | Monroe (28 km) |
| Population Exposed | 214.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-05T15:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-05T11:00:00-04:00 |
| Expires | 2026-09-05T20:00:00-04:00 |
| AreaDesc | Chesterfield; Northern Lancaster; Southern Lancaster |
| SenderName | NWS Columbia SC |
| ZonesUsedForCentroid | 3 |
| ZoneCount | 3 |
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 Monroe?
Calamity.live data shows a weather event with CalamityScore 37/100, near Monroe (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.