Right now
The most recent data we hold from NOAA 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 1 June 2026 at 22:45 UTC. It is kept here as a record.
It is the 34th strongest of the 48 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 16 March 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 1 at 5:56PM EDT until June 1 at 6:45PM EDT by NWS Greenville-Spartanburg SC
An estimated 71,548 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 2, 2026 · score 43 · 6.3 km
- September 6, 2026 · score 46 · 13.5 km
- September 5, 2026 · score 46 · 13.5 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.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 34.8017, -81.2333 |
| Nearest City | Rock Hill (23 km) |
| Population Exposed | 71.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T21:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.71fee6246f5dd24dba3c0a6ef33b8dd661d9708c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chester, SC; York, SC |
| Headline | Severe Thunderstorm Warning issued June 1 at 5:56PM EDT until June 1 at 6:45PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-06-01T18:45:00-04:00 |
| 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 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.
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