Right now
The most recent data we hold from NOAA arrived 2 hours 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 28 August 2026 at 21:30 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 16 March 2026 — 15 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued August 28 at 4:36PM EDT until August 28 at 5:30PM EDT by NWS Jacksonville FL
Urban PEI: 50,612 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 15, 2026 · score 39 · 5.8 km
- July 29, 2026 · score 34 · 9.0 km
- July 29, 2026 · score 39 · 12.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
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.
Event data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 30.8218, -81.1683 |
| Nearest city | St. Marys (38 km) |
| Urban exposure index (PEI) | 50.6K within 50 km |
| Impact tier | significant |
| Timestamp | 2026-08-28T20:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.daff6b667bb0dd9c4e577a2886c4fd7b |
| Licence | US public domain · NOAA National Weather Service |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-08-28T20:36:00.000Z.
First archived: 2026-08-28T20:41:39.336Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
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; Waters from Altamaha Sound GA to Fernandina Beach FL 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 |
| Headline | Special Marine Warning issued August 28 at 4:36PM EDT until August 28 at 5:30PM EDT by NWS Jacksonville FL |
| Expires | 2026-08-28T17:30:00-04:00 |
| SenderName | NWS Jacksonville FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.daff6b667bb0dd9c4e577a2886c4fd7b0688ef5b.001.1","noaa_urn:oid:2.49.0.1.840.0.1b8e8a0a0dc4accf27fafcf20ca148910d927e07.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 4.02 |
| Iem Unit | Inch |
| Iem City | 1 SW Saint Simons |
| Iem County | Glynn |
| Iem State | GA |
| Iem Wfo | JAX |
| Iem Remark | Weather station KGASAINT68 reported 4.02 inches of rainfall over the past few hours. |
| MergedSources | [{"id":"iem_R_31.170_-81.390_1787944140000","source":"iem","severity":"low","severityValue":25,"timestamp":1787944140000,"latitude":31.17,"longitude":-81.39}] |
Safety information
What to do in dangerous seas
Three things first, then what to do before, during and after. From the US National Weather Service.
For this reportSevere Weather · United States
Stay out of rough water
High waves and strong currents can pull even strong swimmers out. Swim only where there are lifeguards.
NWSCaught in a current? Swim sideways
Do not fight it: swim parallel to the shore until you are out of it, or float and wave for help.
NWSKeep off jetties and rocks
Big waves sweep people off piers, breakwaters and rocks.
NWS
Before, during, after. Here it is “after”.
Before · Before going to the sea
Check the forecast
The beach and marine forecast, and the flags on the beach.
Ask the lifeguards
They know today’s currents.
National Weather Service
During · When the sea is rough
Small boats stay in port
Follow the harbour master and the marine warnings.
Helping someone
Call a lifeguard or the emergency number; throw something that floats, do not jump in.
National Weather Service
After · When the sea calms
Currents last
They can stay strong after the waves drop.
National Weather Service
Questions people ask
How do I get out of a rip current?
Stay calm and do not swim against it. Swim parallel to the shore until you are free, then swim back at an angle; or float and wave for help. Source: US National Weather Service.
Is a calm, sunny day safe?
Not always: rip currents often form on calm, sunny days. Swim near lifeguards. Source: US National Weather Service.
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