Right now
The most recent data we hold from NOAA arrived 3 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 23:00 UTC. It is kept here as a record.
It is the 60th strongest of the 81 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 5:52PM EDT until June 18 at 7:00PM EDT by NWS Jacksonville FL
Urban PEI: 82,893 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 14, 2026 · score 43 · 6.7 km
- August 4, 2026 · score 43 · 7.5 km
- July 9, 2026 · score 43 · 11.5 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 | 29.7575, -81.0750 |
| Nearest City | Palm Coast (24 km) |
| Urban exposure index (PEI) | 82.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-18T21:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ad4ae29c90349acf9a8dbca37c2fa737 |
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: 2026-06-18T21:52:00.000Z.
First archived: 2026-06-18T21:58:49.317Z. 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; Coastal waters from St. Augustine to Flagler Beach FL out 20 NM; Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM; Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM; Coastal waters from St. Augustine to Flagler Beach FL out 20 NM |
| Headline | Special Marine Warning issued June 18 at 5:52PM EDT until June 18 at 7:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-18T19:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ad4ae29c90349acf9a8dbca37c2fa737b9b0058f.001.1","noaa_urn:oid:2.49.0.1.840.0.ceb277f2c46605eba906b25b746ab45fff73664a.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 54 |
| Iem Unit | MPH |
| Iem City | 1 ENE Hastings |
| Iem County | St. Johns |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | WeatherStem FSWN St. Johns County Fire Station 8 recorded a peak wind gust of 54 mph. |
| MergedSources | [{"id":"iem_G_29.390_-81.470_1781816220000","source":"iem","severity":"low","severityValue":25,"timestamp":1781816220000,"latitude":29.39,"longitude":-81.47},{"id":"iem_G_29.720_-81.490_1781816400000","source":"iem","severity":"low","severityValue":25,"timestamp":1781816400000,"latitude":29.72,"longitude":-81.49}] |
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.
Review the area, threshold and delivery channel in your account.
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