This alert expired on 21 June 2026 at 00:00 UTC. It is kept here as a record.
No stronger detection stands among the 48 recorded within 20 km of this point since 8 March 2026 — 25 others scored the same. Another comparable one was recorded here earlier the same day. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 20 at 7:35PM EDT until June 20 at 8:00PM EDT by NWS Jacksonville FL
An estimated 1,102,752 people live within 50 km of this point.
Nearby, since 8 March 2026
- August 12, 2026 · score 52 · 3.9 km
- July 11, 2026 · score 52 · 6.9 km
- March 16, 2026 · score 52 · 10.7 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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 | 89% |
| Coordinates | 30.6397, -81.3116 |
| Nearest City | St. Marys (25 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T23:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.9ddacea1a7ae1d28aea50b0aa97dab71 |
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 7:35PM 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:2.49.0.1.840.0.9ddacea1a7ae1d28aea50b0aa97dab7147dc2b0c.001.1","noaa_urn:oid:2.49.0.1.840.0.ffddfaca4378a4d487d77a2caed257c190c3fcac.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 44 |
| Iem Unit | MPH |
| Iem City | 3 SSE Kingsland |
| Iem County | Camden |
| Iem State | GA |
| Iem Wfo | JAX |
| Iem Remark | Mesonet station GA356 I-95 At Camden Welcome Center measured a gust of 44 mph. |
| MergedSources | [{"id":"iem_G_30.220_-81.670_1781995980000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995980000,"latitude":30.22,"longitude":-81.67},{"id":"iem_G_30.220_-81.880_1781993880000","source":"iem","severity":"low","severityValue":25,"timestamp":1781993880000,"latitude":30.22,"longitude":-81.88},{"id":"iem_G_30.330_-81.520_1781993820000","source":"iem","severity":"low","severityValue":25,"timestamp":1781993820000,"latitude":30.33,"longitude":-81.52},{"id":"iem_G_30.750_-81.650_1781995260000","source":"iem","severity":"low","severityValue":25,"timestamp":1781995260000,"latitude":30.75,"longitude":-81.65}] |
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 St. Marys?
Calamity.live data shows a weather event with CalamityScore 52/100, near St. Marys (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.