Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 15 km from here.
This alert expired on 12 September 2026 at 21:18 UTC. It is kept here as a record.
It is the 31st strongest of the 77 detections recorded within 20 km of this point since 8 March 2026. 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 September 12 at 5:08PM EDT until September 12 at 5:15PM EDT by NWS Jacksonville FL
An estimated 1,102,752 people live within 50 km of this point.
Nearby, since 8 March 2026
- August 10, 2026 · score 52 · 1.3 km
- June 19, 2026 · score 52 · 7.1 km
- June 27, 2026 · score 52 · 7.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 85% |
| Coordinates | 30.6573, -81.4726 |
| Nearest City | St. Marys (11 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-12T21:08:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0bdc8c8f6969cc00e6c2c036d348a139fa240c76.001.1 |
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 Fernandina Beach to St. Augustine FL out 20 NM; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM |
| Headline | Special Marine Warning issued September 12 at 5:08PM EDT until September 12 at 5:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-09-12T17:18:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0bdc8c8f6969cc00e6c2c036d348a139fa240c76.001.1","noaa_urn:oid:2.49.0.1.840.0.5e100ecb1e000d7c1243dc79eb2fc27740b2207b.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 44 |
| Iem Unit | MPH |
| Iem City | 4 NE Orange Park |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | AWOS station KNIP Jacksonville Nas measured a peak wind gust of 44 mph. |
| MergedSources | [{"id":"iem_G_30.500_-81.680_1789243920000","source":"iem","severity":"low","severityValue":25,"timestamp":1789243920000,"latitude":30.5,"longitude":-81.68},{"id":"iem_G_30.220_-81.670_1789246320000","source":"iem","severity":"low","severityValue":25,"timestamp":1789246320000,"latitude":30.22,"longitude":-81.67}] |
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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