This alert expired on 2 June 2026 at 08:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 39 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: Special Marine Warning issued June 2 at 3:11AM EDT until June 2 at 4:15AM EDT by NWS Charleston SC
An estimated 109,477 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 24, 2026 · score 43 · 4.2 km
- June 18, 2026 · score 43 · 4.2 km
- August 3, 2026 · score 39 · 5.2 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 81 % 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 | 81% |
| Coordinates | 32.2286, -80.5748 |
| Nearest City | Hilton Head Island (16 km) |
| Population Exposed | 109.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-02T07:11:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.fb1fc0d0c98976ed697281295899fe40d86c786d.001.1 |
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; Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary; Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM; Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued June 2 at 3:11AM EDT until June 2 at 4:15AM EDT by NWS Charleston SC |
| Expires | 2026-06-02T04:15:00-04:00 |
| 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.
Want to know when something happens near Hilton Head Island?
Calamity.live data shows a weather event with CalamityScore 43/100, near Hilton Head Island (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.