This alert expired on 21 June 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 130 recorded within 20 km of this point since 8 March 2026 — 69 others scored the same. Another comparable one was recorded here earlier the same day. 16 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 20 at 6:54PM EDT until June 20 at 8:00PM EDT by NWS Jacksonville FL
An estimated 1,122,771 people live within 50 km of this point.
Nearby, since 8 March 2026
- March 16, 2026 · score 52 · 2.1 km
- July 11, 2026 · score 52 · 6.7 km
- July 13, 2026 · score 52 · 9.2 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 79 % 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 | 79% |
| Coordinates | 30.5410, -81.3500 |
| Nearest City | Jacksonville Beach (28 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T22:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.fd651fe016776c1920546f15a373d494 |
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; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM |
| Headline | Special Marine Warning issued June 20 at 6:54PM EDT until June 20 at 8:00PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-20T20:00:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fd651fe016776c1920546f15a373d494b2ddd9d9.001.1","noaa_urn:oid:2.49.0.1.840.0.1bd4609bcb3182720efb63d7a5d5007458483079.001.1"] |
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.