This alert expired on 16 March 2026 at 01:00 UTC. It is kept here as a record.
It is the 5th strongest of the 18 detections recorded within 20 km of this point since 15 March 2026.
What the source measured
NOAA reported: Special Marine Warning issued March 15 at 7:30PM EDT until March 15 at 9:00PM EDT by NWS Jacksonville FL
Nearby, since 15 March 2026
- June 18, 2026 · score 39 · 14.5 km
- July 26, 2026 · score 39 · 21.6 km
- May 12, 2026 · score 34 · 23.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 62 % 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) | 22 / 100 |
| Our confidence | 62% |
| Coordinates | 30.3190, -80.7540 |
| Nearest City | Jacksonville Beach (61 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-15T23:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1b15d4c91b8e14573fb8ae41c630d4bd1626b7c9.001.1 |
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 |
| Headline | Special Marine Warning issued March 15 at 7:30PM EDT until March 15 at 9:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-03-15T21:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 42 |
| Iem Unit | MPH |
| Iem City | 2 NW Saint Augustine |
| Iem County | St. Johns |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | Mesonet station XLWS Lewis. |
| MergedSources | [{"id":"iem_G_29.920_-81.330_1773617220000","source":"iem","severity":"low","severityValue":25,"timestamp":1773617220000,"latitude":29.92,"longitude":-81.33}] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.