Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 June 2026 at 23:15 UTC. It is kept here as a record.
It is the 14th strongest of the 22 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 21 at 5:11PM EDT until June 21 at 7:15PM EDT by NWS Charleston SC
Nearby, since 16 March 2026
- June 23, 2026 · score 22 · 16.2 km
- August 28, 2026 · score 39 · 18.3 km
- July 29, 2026 · score 34 · 19.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 30.8489, -80.9797 |
| Nearest City | St. Marys (56 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-21T21:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.f26585ca2107cf57b2a860ec8da31dc9 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary; Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM; 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 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 |
| Headline | Special Marine Warning issued June 21 at 5:11PM EDT until June 21 at 7:15PM EDT by NWS Charleston SC |
| Expires | 2026-06-21T19:15:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f26585ca2107cf57b2a860ec8da31dc982be7d89.001.1","noaa_urn:oid:2.49.0.1.840.0.6e708b7965bb8bb76898e7448ef42e47a92bcbf7.001.1","noaa_urn:oid:2.49.0.1.840.0.ae30914ab803a0777dfe4db68900c6534cf5c453.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 42 |
| Iem Unit | MPH |
| Iem City | 1 ENE Fort Caroline |
| Iem County | Duval |
| Iem State | FL |
| Iem Wfo | JAX |
| Iem Remark | Mesonet station XJAK Jacksonville measured 42 mph. |
| MergedSources | [{"id":"iem_G_30.660_-81.540_1782072360000","source":"iem","severity":"low","severityValue":25,"timestamp":1782072360000,"latitude":30.66,"longitude":-81.54},{"id":"iem_G_30.390_-81.480_1782073500000","source":"iem","severity":"low","severityValue":25,"timestamp":1782073500000,"latitude":30.39,"longitude":-81.48}] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.