This alert expired on 28 May 2026 at 22:15 UTC. It is kept here as a record.
It is the 21st strongest of the 37 detections recorded within 20 km of this point since 11 May 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 28 at 5:19PM EDT until May 28 at 6:15PM EDT by NWS Jacksonville FL
An estimated 118,483 people live within 50 km of this point.
Nearby, since 11 May 2026
- June 2, 2026 · score 43 · 4.9 km
- July 5, 2026 · score 43 · 5.9 km
- July 15, 2026 · score 52 · 12.0 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 78 % 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 | 78% |
| Coordinates | 30.2033, -81.0998 |
| Nearest City | Palm Valley (28 km) |
| Population Exposed | 118.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T21:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.bdd975cce9e11f936ac20d49d6b56377 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from St. Augustine to Flagler Beach FL out 20 NM; Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM |
| Headline | Special Marine Warning issued May 28 at 5:19PM EDT until May 28 at 6:15PM EDT by NWS Jacksonville FL |
| Expires | 2026-05-28T18:15:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bdd975cce9e11f936ac20d49d6b5637792f898ea.001.1","noaa_urn:oid:2.49.0.1.840.0.529dad48560565a94a8312dbed2b3fea98e887e3.001.1"] |
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 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 185 scientific monitoring sources.