This alert expired on 23 June 2026 at 22:45 UTC. It is kept here as a record.
It is the 17th strongest of the 42 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 21 June 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 23 at 5:49PM EDT until June 23 at 6:45PM EDT by NWS Jacksonville FL
An estimated 174,971 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 26, 2026 · score 52 · 5.3 km
- July 15, 2026 · score 43 · 9.1 km
- July 20, 2026 · score 52 · 9.1 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % 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) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 30.0474, -81.2448 |
| Nearest City | Palm Valley (20 km) |
| Population Exposed | 175.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-23T21:49:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.146d75a6448fa20c46d00a2646e11c35 |
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; Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM; Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM; Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM |
| Headline | Special Marine Warning issued June 23 at 5:49PM EDT until June 23 at 6:45PM EDT by NWS Jacksonville FL |
| Expires | 2026-06-23T18:45:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.146d75a6448fa20c46d00a2646e11c355d5e62ed.001.1","noaa_urn:oid:2.49.0.1.840.0.756f011cab7802c3bfa0931f87a792232a2a5206.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 49 |
| Iem Unit | MPH |
| Iem City | 1 NE Jacksonville Inter |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | ASOS at Jacksonville International Airport measured a wind gust of 49 mph. |
| MergedSources | [{"id":"iem_G_30.320_-81.640_1782249600000","source":"iem","severity":"low","severityValue":25,"timestamp":1782249600000,"latitude":30.32,"longitude":-81.64},{"id":"iem_G_30.280_-81.810_1782249300000","source":"iem","severity":"low","severityValue":25,"timestamp":1782249300000,"latitude":30.28,"longitude":-81.81},{"id":"iem_G_30.500_-81.690_1782249060000","source":"iem","severity":"low","severityValue":25,"timestamp":1782249060000,"latitude":30.5,"longitude":-81.69}] |
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 Palm Valley?
Calamity.live data shows a weather event with CalamityScore 43/100, near Palm Valley (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.