Right now
The most recent data we hold from NOAA arrived 52 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 16 March 2026 at 01:45 UTC. It is kept here as a record.
It is the 10th strongest of the 25 detections recorded within 20 km of this point since 16 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 15 at 8:52PM EDT until March 15 at 9:45PM EDT by NWS Jacksonville FL
An estimated 17,968 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 29, 2026 · score 34 · 6.3 km
- August 28, 2026 · score 39 · 14.7 km
- June 15, 2026 · score 39 · 15.1 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 87% |
| Coordinates | 30.7097, -81.0871 |
| Nearest City | St. Marys (44 km) |
| Population Exposed | 18.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T00:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.6d4ca4b05fcdc1a405afcba3d2dd534c |
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; Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM |
| Headline | Special Marine Warning issued March 15 at 8:52PM EDT until March 15 at 9:45PM EDT by NWS Jacksonville FL |
| Expires | 2026-03-15T21:45:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6d4ca4b05fcdc1a405afcba3d2dd534c59103fd4.001.1","noaa_urn:oid:2.49.0.1.840.0.6341a4808c19fcc5fd5f542924cafde4fea43ef4.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 1 SE Jacksonville |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | Mesonet station 1562W Fpr Wjct Jacksonville. |
| MergedSources | [{"id":"iem_G_30.620_-81.470_1773622500000","source":"iem","severity":"low","severityValue":25,"timestamp":1773622500000,"latitude":30.62,"longitude":-81.47},{"id":"iem_G_30.380_-81.420_1773620280000","source":"iem","severity":"low","severityValue":25,"timestamp":1773620280000,"latitude":30.38,"longitude":-81.42},{"id":"iem_M_30.290_-81.390_1773621000000","source":"iem","severity":"low","severityValue":25,"timestamp":1773621000000,"latitude":30.29,"longitude":-81.39},{"id":"iem_G_30.340_-81.630_1773621780000","source":"iem","severity":"low","severityValue":25,"timestamp":1773621780000,"latitude":30.34,"longitude":-81.63},{"id":"iem_M_30.290_-81.390_1773620400000","source":"iem","severity":"low","severityValue":25,"timestamp":1773620400000,"latitude":30.29,"longitude":-81.39},{"id":"iem_G_30.320_-81.640_1773621600000","source":"iem","severity":"low","severityValue":25,"timestamp":1773621600000,"latitude":30.32,"longitude":-81.64}] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.