This alert expired on 19 June 2026 at 00:02 UTC. It is kept here as a record.
No stronger detection stands among the 15 recorded within 20 km of this point since 16 March 2026 — 14 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 7:53PM EDT until June 18 at 8:00PM EDT by NWS Jacksonville FL
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 59 % 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) | 22 / 100 |
| Our confidence | 59% |
| Coordinates | 30.7232, -80.7635 |
| Nearest City | St. Marys (75 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-18T23:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ce63c0bf31e33bb53bbe015435d764e0 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from St. Augustine to Flagler Beach FL out 20 NM; Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM; Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM; 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 June 18 at 7:53PM EDT until June 18 at 8:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-18T20:02:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ce63c0bf31e33bb53bbe015435d764e0d7af1795.001.1","noaa_urn:oid:2.49.0.1.840.0.f3c9ac252cf3680d230fa0b3397ccd4c19e8581b.001.1","noaa_urn:oid:2.49.0.1.840.0.6aac252440ce7d22fa29fa7191bf07492eba3218.001.1"] |
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?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.