This alert expired on 27 May 2026 at 09:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 20 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 23 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 26 at 5:24PM EDT until May 28 at 3:24AM EDT by NWS Columbia SC
An estimated 23,260 people live within 50 km of this point.
Nearby, since 12 March 2026
- May 28, 2026 · score 34 · 0.0 km
- May 27, 2026 · score 34 · 0.0 km
- August 6, 2026 · score 28 · 4.2 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 90 % 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) | 34 / 100 |
| Our confidence | 90% |
| Coordinates | 34.1600, -81.8080 |
| Nearest City | Greenwood (33 km) |
| Population Exposed | 23.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-26T22:39:00.000Z |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Greenwood, SC; Newberry, SC; Saluda, SC |
| Headline | Flood Warning issued May 26 at 5:24PM EDT until May 28 at 3:24AM EDT by NWS Columbia SC |
| Expires | 2026-05-27T05:30:00-04:00 |
| SenderName | NWS Columbia SC |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | Waterloo |
| Iem County | Laurens |
| Iem State | SC |
| Iem Wfo | GSP |
| Iem Remark | Multiple social media reports of flooding around the Waterloo area. |
| MergedSources | [{"id":"iem_F_34.540_-81.990_1779840420000","source":"iem","severity":"low","severityValue":25,"timestamp":1779840420000,"latitude":34.54,"longitude":-81.99},{"id":"iem_F_34.500_-82.010_1779840360000","source":"iem","severity":"low","severityValue":25,"timestamp":1779840360000,"latitude":34.5,"longitude":-82.01},{"id":"iem_F_34.470_-81.880_1779840480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779840480000,"latitude":34.47,"longitude":-81.88},{"id":"iem_F_34.490_-81.980_1779840180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779840180000,"latitude":34.49,"longitude":-81.98},{"id":"iem_E_34.000_-81.770_1779832740000","source":"iem","severity":"low","severityValue":25,"timestamp":1779832740000,"latitude":34,"longitude":-81.77},{"id":"iem_F_34.350_-82.060_1779840720000","source":"iem","severity":"low","severityValue":25,"timestamp":1779840720000,"latitude":34.35,"longitude":-82.06}] |
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 34/100, near Greenwood (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.