This alert expired on 21 June 2026 at 21:00 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 16 March 2026 — 4 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 June 21 at 4:41PM EDT until June 21 at 5:00PM EDT by NWS Melbourne FL
An estimated 102,912 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 23, 2026 · score 39 · 15.7 km
- June 15, 2026 · score 39 · 18.1 km
- July 13, 2026 · score 39 · 19.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 29.9137, -80.9905 |
| Nearest City | Palm Coast (43 km) |
| Population Exposed | 102.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-21T20:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ad2987144dd8d783c6b76c17c9417b83 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Volusia-Brevard County Line to Sebastian Inlet 0-20 nm; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM; Coastal waters from St. Augustine to Flagler Beach 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; Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM and 1 more areas |
| Headline | Special Marine Warning issued June 21 at 4:41PM EDT until June 21 at 5:00PM EDT by NWS Melbourne FL |
| Expires | 2026-06-21T17:00:00-04:00 |
| SenderName | NWS Melbourne FL |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ad2987144dd8d783c6b76c17c9417b839fe00cf9.001.1","noaa_urn:oid:2.49.0.1.840.0.ddbf59e8595e28abcc429595c0db2d3565761be4.001.1","noaa_urn:oid:2.49.0.1.840.0.ae30914ab803a0777dfe4db68900c6534cf5c453.001.1","noaa_urn:oid:2.49.0.1.840.0.eac5d98a5fe91b795bdc320bdff73c8b44c2c74e.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 8 March 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 in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.