This alert expired on 16 March 2026 at 02:45 UTC. It is kept here as a record.
No stronger detection stands among the 130 recorded within 20 km of this point since 8 March 2026 — 69 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 15 at 9:54PM EDT until March 15 at 10:45PM EDT by NWS Jacksonville FL
An estimated 1,122,771 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 20, 2026 · score 52 · 2.1 km
- July 11, 2026 · score 52 · 7.7 km
- August 12, 2026 · score 52 · 8.5 km
How we know
Confirmed by 16 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 88% |
| Coordinates | 30.5555, -81.3645 |
| Nearest City | St. Marys (26 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T01:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.29beb0f3ac797f82ee94fd1e3843442f27074218.001.1 |
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 |
| Headline | Special Marine Warning issued March 15 at 9:54PM EDT until March 15 at 10:45PM EDT by NWS Jacksonville FL |
| Expires | 2026-03-15T22:45:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 48 |
| 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 reported wind gust to 48 mph from the South. |
| 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_30.320_-81.640_1773625200000","source":"iem","severity":"low","severityValue":25,"timestamp":1773625200000,"latitude":30.32,"longitude":-81.64},{"id":"iem_G_30.380_-81.420_1773620280000","source":"iem","severity":"low","severityValue":25,"timestamp":1773620280000,"latitude":30.38,"longitude":-81.42},{"id":"iem_G_30.220_-81.670_1773618780000","source":"iem","severity":"low","severityValue":25,"timestamp":1773618780000,"latitude":30.22,"longitude":-81.67},{"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_29.920_-81.330_1773617220000","source":"iem","severity":"low","severityValue":25,"timestamp":1773617220000,"latitude":29.92,"longitude":-81.33},{"id":"iem_M_30.390_-81.440_1773626400000","source":"iem","severity":"low","severityValue":25,"timestamp":1773626400000,"latitude":30.39,"longitude":-81.44},{"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_29.890_-81.310_1773619200000","source":"iem","severity":"low","severityValue":25,"timestamp":1773619200000,"latitude":29.89,"longitude":-81.31},{"id":"iem_G_31.050_-81.410_1773623880000","source":"iem","severity":"low","severityValue":25,"timestamp":1773623880000,"latitude":31.05,"longitude":-81.41},{"id":"iem_G_30.330_-81.520_1773625980000","source":"iem","severity":"low","severityValue":25,"timestamp":1773625980000,"latitude":30.33,"longitude":-81.52},{"id":"iem_G_30.500_-81.680_1773626160000","source":"iem","severity":"low","severityValue":25,"timestamp":1773626160000,"latitude":30.5,"longitude":-81.68},{"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},{"id":"iem_G_30.220_-81.670_1773624180000","source":"iem","severity":"low","severityValue":25,"timestamp":1773624180000,"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 10 February 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 near St. Marys?
Calamity.live data shows a weather event with CalamityScore 52/100, near St. Marys (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.