This alert expired on 28 June 2026 at 19:30 UTC. It is kept here as a record.
No stronger detection stands among the 43 recorded within 20 km of this point since 16 March 2026 — 5 others scored the same. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 28 at 3:21PM EDT until June 28 at 3:30PM EDT by NWS Greenville-Spartanburg SC
An estimated 109,415 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 27, 2026 · score 32 · 10.2 km
- July 5, 2026 · score 43 · 11.7 km
- August 2, 2026 · score 43 · 21.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 34.7357, -81.5115 |
| Nearest City | Spartanburg (45 km) |
| Population Exposed | 109.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T19:21:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Union, SC; Chester, SC; Union, SC; York, SC |
| Headline | Severe Thunderstorm Warning issued June 28 at 3:21PM EDT until June 28 at 3:30PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-06-28T15:30:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2ba1c6fad8a8714b78f12fc9cfd05cf97d122471.001.1","noaa_urn:oid:2.49.0.1.840.0.ef07f16037b500ec7df5e8df4a78925ff9283216.001.1"] |
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 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 43/100, near Spartanburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.