Right now
The most recent data we hold from NOAA arrived 2 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 31 May 2026 at 01:30 UTC. It is kept here as a record.
It is the 7th strongest of the 25 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 30 at 8:37PM EDT until May 30 at 9:30PM EDT by NWS Charleston SC
An estimated 257,257 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 11, 2026 · score 43 · 16.0 km
- June 18, 2026 · score 43 · 19.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 37 / 100 |
| Our confidence | 80% |
| Coordinates | 31.8531, -80.6769 |
| Nearest City | Wilmington Island (32 km) |
| Population Exposed | 257.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T00:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.b4a48c2beb3c39aac0f3370622bd167f |
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; 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 May 30 at 8:37PM EDT until May 30 at 9:30PM EDT by NWS Charleston SC |
| Expires | 2026-05-30T21:30:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b4a48c2beb3c39aac0f3370622bd167f715f3e27.001.1","noaa_urn:oid:2.49.0.1.840.0.4232b8c18ad5372d0da83416305ca09dfaff459d.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.
Want to know when something happens in this area?