Right now
The most recent data we hold from NOAA arrived 5 minutes 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 18 June 2026 at 23:19 UTC. It is kept here as a record.
It is the 7th strongest of the 18 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 7:09PM EDT until June 18 at 7:15PM EDT by NWS Jacksonville FL
Urban PEI: 23,064 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 26, 2026 · score 39 · 13.5 km
- June 18, 2026 · score 39 · 20.4 km
- August 12, 2026 · score 52 · 22.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 34 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 30.5314, -80.9700 |
| Nearest City | Jacksonville Beach (48 km) |
| Urban exposure index (PEI) | 23.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T23:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ac16269f3ffe5f36fcea26c705d278ba |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-18T23:09:00.000Z.
First archived: 2026-06-18T23:13:21.629Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
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; 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 and 2 more areas |
| Headline | Special Marine Warning issued June 18 at 7:09PM EDT until June 18 at 7:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-18T19:19:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ac16269f3ffe5f36fcea26c705d278ba9176c4c6.001.1","noaa_urn:oid:2.49.0.1.840.0.3a39fbd85c7d51ba317227e1fe452b3850327279.001.1","noaa_urn:oid:2.49.0.1.840.0.7037d52e0e54d7ae50d4578e33c0652afd74692d.001.1","noaa_urn:oid:2.49.0.1.840.0.187360f03fdbea368464ffd031839dc373a583c1.001.1","noaa_urn:oid:2.49.0.1.840.0.5d4393d0913ee6a8339598653d276da22318e813.001.1"] |
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.
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