This alert expired on 28 May 2026 at 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 67 recorded within 20 km of this point since 8 March 2026 — 31 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 28 at 3:54PM EDT until May 28 at 5:00PM EDT by NWS Jacksonville FL
An estimated 1,157,678 people live within 50 km of this point.
Nearby, since 8 March 2026
- May 11, 2026 · score 52 · 1.7 km
- July 15, 2026 · score 52 · 1.8 km
- June 19, 2026 · score 52 · 5.1 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 | 30.2713, -81.2120 |
| Nearest City | Jacksonville Beach (17 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T19:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.0042f25d287cfbee95402954656637df |
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 |
| Headline | Special Marine Warning issued May 28 at 3:54PM EDT until May 28 at 5:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-05-28T17:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0042f25d287cfbee95402954656637df2885245b.001.1","noaa_urn:oid:2.49.0.1.840.0.dc2ee6d11c44cee0a29a1e3b63e1e1d7748922b5.001.1"] |
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.
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.