Right now
The most recent data we hold from NOAA arrived 60 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 19 June 2026 at 00:00 UTC. It is kept here as a record.
It is the 7th strongest of the 20 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 7:28PM EDT until June 18 at 8:00PM EDT by NWS Jacksonville FL
Nearby, since 15 March 2026
- March 15, 2026 · score 22 · 7.5 km
- June 18, 2026 · score 39 · 8.0 km
- July 26, 2026 · score 39 · 14.3 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.65/1 |
| Coordinates | 30.3626, -80.8142 |
| Nearest City | Jacksonville Beach (56 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-18T23:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.7d71dea5e9a5aaa0e607c28e7866bdbd |
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: 2026-06-18T23:28:00.000Z.
First archived: 2026-06-18T23:39:55.951Z. 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 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 and 1 more areas |
| Headline | Special Marine Warning issued June 18 at 7:28PM EDT until June 18 at 8:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-18T20:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7d71dea5e9a5aaa0e607c28e7866bdbd11d2e517.001.1","noaa_urn:oid:2.49.0.1.840.0.f3c9ac252cf3680d230fa0b3397ccd4c19e8581b.001.1","noaa_urn:oid:2.49.0.1.840.0.862ccd1751101682c887adaa898b10f420e5eabe.002.1","noaa_urn:oid:2.49.0.1.840.0.187360f03fdbea368464ffd031839dc373a583c1.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 45 |
| Iem Unit | MPH |
| Iem City | 1 NNE Saint Augustine B |
| Iem County | St. Johns |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | CMAN station SAUF1 1 NNE Saint Augustine Beach reported a gust to 39 knots or 45 mph from the southwest. |
| MergedSources | [{"id":"iem_G_29.860_-81.270_1781817780000","source":"iem","severity":"low","severityValue":25,"timestamp":1781817780000,"latitude":29.86,"longitude":-81.27}] |
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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