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 01:00 UTC. It is kept here as a record.
It is the 21st strongest of the 58 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 30 May 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 30 at 8:06PM EDT until May 30 at 9:00PM EDT by NWS Charleston SC
An estimated 280,390 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 11, 2026 · score 43 · 1.5 km
- June 18, 2026 · score 43 · 11.9 km
- July 12, 2026 · score 43 · 13.3 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 | 31.9438, -80.7963 |
| Nearest City | Wilmington Island (18 km) |
| Population Exposed | 280.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T00:06:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.c7d48df4f1b62da6d08ad898bfe96bb770f9e23f.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 May 30 at 8:06PM EDT until May 30 at 9:00PM EDT by NWS Charleston SC |
| Expires | 2026-05-30T21:00:00-04:00 |
| 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 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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