This alert expired on 20 July 2026 at 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 137 recorded within 20 km of this point since 8 March 2026 — 66 others scored the same. The last comparable one was on 15 July 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 20 at 4:03PM EDT until July 20 at 5:00PM EDT by NWS Jacksonville FL
An estimated 1,192,133 people live within 50 km of this point.
Nearby, since 8 March 2026
- June 13, 2026 · score 52 · 0.8 km
- July 11, 2026 · score 52 · 3.0 km
- July 13, 2026 · score 52 · 5.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 80 % 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 | 80% |
| Coordinates | 30.4644, -81.3982 |
| Nearest City | Jacksonville Beach (19 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-20T20:03:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.86a2a04b08d061fb07c8de4e5b5bafd1 |
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 |
| Headline | Special Marine Warning issued July 20 at 4:03PM EDT until July 20 at 5:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-07-20T17:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.86a2a04b08d061fb07c8de4e5b5bafd19aaac4a9.001.1","noaa_urn:oid:2.49.0.1.840.0.4d168aa63b638c187ea2fdf62589e30e907b2eb7.001.1"] |
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 Jacksonville Beach?
Calamity.live data shows a weather event with CalamityScore 52/100, near Jacksonville Beach (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.