This alert expired on 12 August 2026 at 21:15 UTC. It is kept here as a record.
No stronger detection stands among the 42 recorded within 20 km of this point since 12 March 2026 — 7 others scored the same. The last comparable one was on 29 July 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 12 at 4:13PM EDT until August 12 at 5:15PM EDT by NWS Jacksonville FL
An estimated 50,612 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 12, 2026 · score 39 · 6.9 km
- July 11, 2026 · score 39 · 6.9 km
- June 13, 2026 · score 32 · 9.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 84 % 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) | 39 / 100 |
| Our confidence | 84% |
| Coordinates | 31.0674, -81.3253 |
| Nearest City | Brunswick (18 km) |
| Population Exposed | 50.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T20:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7b5642cd990631565107ff7ae18406c0b942e506.001.1 |
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 August 12 at 4:13PM EDT until August 12 at 5:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-08-12T17:15:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 47 |
| Iem Unit | MPH |
| Iem City | 2 NE Jacksonville Inter |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | ASOS station KJAX Jacksonville Intl Airport measured a peak wind gust of 47 mph. |
| MergedSources | [{"id":"iem_G_30.500_-81.680_1786559460000","source":"iem","severity":"low","severityValue":25,"timestamp":1786559460000,"latitude":30.5,"longitude":-81.68}] |
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.
Calamity.live data shows a weather event with CalamityScore 39/100, near Brunswick (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.