Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest 12 km from here.
This alert expired on 11 September 2026 at 22:00 UTC. It is kept here as a record.
It is the 10th strongest of the 20 detections recorded within 20 km of this point since 18 June 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 11 at 5:31PM EDT until September 11 at 6:00PM EDT by NWS Columbia SC
An estimated 38,228 people live within 50 km of this point.
Nearby, since 18 June 2026
- August 3, 2026 · score 34 · 8.7 km
- August 6, 2026 · score 22 · 13.9 km
- September 11, 2026 · score 32 · 15.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 79% |
| Coordinates | 34.4963, -80.0711 |
| Nearest City | Florence (44 km) |
| Population Exposed | 38.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-11T21:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6214b84ef60ea6b6d35a05225f19430f063db0fd.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Chesterfield, SC; Kershaw, SC; Lee, SC; Kershaw, SC; Lee, SC; Sumter, SC; Scotland, NC |
| Headline | Severe Thunderstorm Warning issued September 11 at 5:31PM EDT until September 11 at 6:00PM EDT by NWS Columbia SC |
| Expires | 2026-09-11T18:00:00-04:00 |
| SenderName | NWS Columbia SC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6214b84ef60ea6b6d35a05225f19430f063db0fd.002.1","noaa_urn:oid:2.49.0.1.840.0.cfed61b8c17d082d844f305c22646203d6e9fb28.001.1","noaa_urn:oid:2.49.0.1.840.0.9639891a89055c0413978ffbc62fbb4de7b7394b.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 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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