This alert expired on 11 August 2026 at 23:00 UTC. It is kept here as a record.
It is the 4th strongest of the 27 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 2 August 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 6:03PM EDT until August 11 at 7:00PM EDT by NWS Greenville-Spartanburg SC
An estimated 63,546 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 1, 2026 · score 39 · 5.8 km
- July 10, 2026 · score 39 · 10.7 km
- May 22, 2026 · score 34 · 20.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 34.5679, -82.9021 |
| Nearest City | Clemson (14 km) |
| Population Exposed | 63.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T22:03:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.638c577613de2ad52d26abd7aa84180550aebe01.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hart, GA; Anderson, SC; Oconee, SC |
| Headline | Severe Thunderstorm Warning issued August 11 at 6:03PM EDT until August 11 at 7:00PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-08-11T19:00:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 39/100, near Clemson (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.