This alert expired on 26 May 2026 at 04:15 UTC. It is kept here as a record.
No stronger detection stands among the 46 recorded within 20 km of this point since 16 March 2026 — 24 others scored the same. The last comparable one was on 16 March 2026.
What the source measured
NOAA reported: Flash Flood Warning issued May 25 at 8:13PM EDT until May 26 at 12:15AM EDT by NWS Greenville-Spartanburg SC
An estimated 216,235 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 29, 2026 · score 43 · 4.7 km
- June 27, 2026 · score 43 · 16.6 km
- July 11, 2026 · score 43 · 16.6 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 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 34.7045, -82.7379 |
| Nearest City | Clemson (10 km) |
| Population Exposed | 216.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-26T00:13:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.8874dd155f2ecb519ac044e49d4ecdcc |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Henderson, NC; Madison, GA; Oglethorpe, GA |
| Headline | Flash Flood Warning issued May 25 at 8:13PM EDT until May 26 at 12:15AM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-05-26T00:15:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8874dd155f2ecb519ac044e49d4ecdcc8950e80b.001.1","noaa_urn:oid:2.49.0.1.840.0.e3db46b24b226a2adfc1635b03eb2b9cb27b95fb.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 Clemson (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.