This alert expired on 18 June 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 31 May 2026 — 11 others scored the same. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 4:55PM EDT until June 18 at 5:30PM EDT by NWS Jacksonville FL
An estimated 162,918 people live within 50 km of this point.
Nearby, since 31 May 2026
- June 21, 2026 · score 43 · 3.7 km
- June 15, 2026 · score 43 · 3.9 km
- June 29, 2026 · score 43 · 10.3 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 79 % 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 | 79% |
| Coordinates | 31.6688, -81.0775 |
| Nearest City | Wilmington Island (38 km) |
| Population Exposed | 162.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T20:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.205a9af4e1c85eb046f3a51925437a1b |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 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 |
| Headline | Special Marine Warning issued June 18 at 4:55PM EDT until June 18 at 5:30PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-18T17:30:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.205a9af4e1c85eb046f3a51925437a1b8f1dd2da.001.1","noaa_urn:oid:2.49.0.1.840.0.ef895a5666373bec25d2f4fdaf3833b1eb05a5c0.001.1"] |
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 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 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.