This alert expired on 30 August 2026 at 15:00 UTC. It is kept here as a record.
It is the 5th strongest of the 21 detections recorded within 20 km of this point since 19 June 2026. The last comparable one was on 29 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued August 30 at 9:35AM EDT until August 30 at 11:00AM EDT by NWS Charleston SC
An estimated 77,611 people live within 50 km of this point.
Nearby, since 19 June 2026
- July 13, 2026 · score 39 · 9.6 km
- August 10, 2026 · score 39 · 17.6 km
- July 27, 2026 · score 39 · 18.5 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 82 % 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) | 39 / 100 |
| Our confidence | 82% |
| Coordinates | 32.1412, -80.3338 |
| Nearest City | Hilton Head Island (39 km) |
| Population Exposed | 77.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-30T13:35:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Edisto Beach SC to Savannah GA out 20 NM; Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued August 30 at 9:35AM EDT until August 30 at 11:00AM EDT by NWS Charleston SC |
| Expires | 2026-08-30T11:00:00-04:00 |
| SenderName | NWS Charleston 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 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 39/100, near Hilton Head Island (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.