This alert expired on 23 June 2026 at 22:30 UTC. It is kept here as a record.
No stronger detection stands among the 161 recorded within 20 km of this point since 8 March 2026 — 84 others scored the same. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 23 at 5:15PM EDT until June 23 at 6:30PM EDT by NWS Jacksonville FL
An estimated 1,152,133 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 13, 2026 · score 52 · 1.0 km
- July 13, 2026 · score 52 · 5.1 km
- August 8, 2026 · score 52 · 5.6 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 30.5326, -81.4716 |
| Nearest City | St. Marys (23 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-23T21:15:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f9d97f0bf854cba58f8391825afd021adf290b34.001.1 |
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; Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM; Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM |
| Headline | Special Marine Warning issued June 23 at 5:15PM EDT until June 23 at 6:30PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-23T18:30:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 41 |
| Iem Unit | MPH |
| Iem City | 1 SE Hilliard |
| Iem County | Nassau |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | WeatherStem Station FSWN Hilliard measured a wind gust of 41 mph. |
| MergedSources | [{"id":"iem_G_30.690_-81.910_1782248400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782248400000,"latitude":30.69,"longitude":-81.91},{"id":"iem_G_30.500_-81.690_1782249060000","source":"iem","severity":"low","severityValue":25,"timestamp":1782249060000,"latitude":30.5,"longitude":-81.69},{"id":"iem_G_30.680_-81.910_1782248400000","source":"iem","severity":"low","severityValue":25,"timestamp":1782248400000,"latitude":30.68,"longitude":-81.91}] |
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.