This alert expired on 31 May 2026 at 04:00 UTC. It is kept here as a record.
No stronger detection stands among the 30 recorded within 20 km of this point since 31 May 2026 — 19 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 30 at 10:03PM EDT until May 31 at 12:00AM EDT by NWS Charleston SC
An estimated 186,051 people live within 50 km of this point.
Nearby, since 31 May 2026
- June 14, 2026 · score 43 · 2.1 km
- June 29, 2026 · score 43 · 3.5 km
- August 13, 2026 · score 43 · 5.0 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 | 31.7762, -81.0077 |
| Nearest City | Wilmington Island (25 km) |
| Population Exposed | 186.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T02:03:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.af22c4c0f648f3c3237c146b188f874e00499848.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary; Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued May 30 at 10:03PM EDT until May 31 at 12:00AM EDT by NWS Charleston SC |
| Expires | 2026-05-31T00:00:00-04:00 |
| 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 43/100, near Wilmington Island (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.