Right now
The most recent data we hold from NOAA arrived 33 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 21 June 2026 at 01:00 UTC. It is kept here as a record.
It is the 8th strongest of the 18 detections recorded within 20 km of this point since 11 May 2026. The last comparable one was on 18 June 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 20 at 7:52PM EDT until June 20 at 9:00PM EDT by NWS Jacksonville FL
Urban PEI: 78,483 within a heuristic 50 km radius; not unique people.
Nearby, since 11 May 2026
- May 12, 2026 · score 39 · 4.4 km
- June 18, 2026 · score 39 · 9.8 km
- July 26, 2026 · score 39 · 12.7 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 30.2980, -80.9720 |
| Nearest City | Jacksonville Beach (40 km) |
| Urban exposure index (PEI) | 78.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T23:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0ea47ba521f68c6dae986e491b14c2d61d0f1378.001.1 |
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: 2026-06-20T23:52:00.000Z.
First archived: 2026-06-21T00:09:40.424Z. 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 Fernandina Beach to St. Augustine FL out 20 NM; Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM |
| Headline | Special Marine Warning issued June 20 at 7:52PM EDT until June 20 at 9:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-20T21:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 4 SSW Fort Caroline |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | ASOS station KCRG Jacksonvil Craig measured a wind gust of 40 mph. |
| MergedSources | [{"id":"iem_G_30.220_-81.670_1781995980000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995980000,"latitude":30.22,"longitude":-81.67},{"id":"iem_G_30.330_-81.520_1781993820000","source":"iem","severity":"low","severityValue":25,"timestamp":1781993820000,"latitude":30.33,"longitude":-81.52}] |
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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