Right now
The most recent data we hold from NOAA arrived 6 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 19 June 2026 at 01:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 42 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 14 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 18 at 8:08PM EDT until June 18 at 9:45PM EDT by NWS Charleston SC
Nearby, since 16 March 2026
- June 19, 2026 · score 22 · 21.3 km
- August 6, 2026 · score 16 · 21.8 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Legacy data-support index | 0.69/1 |
| Coordinates | 31.5109, -80.7057 |
| Nearest City | Wilmington Island (60 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-19T00:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.cf1e368877faf930748afaefcc74379b |
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: 2026-06-19T00:08:00.000Z.
First archived: 2026-06-19T00:43:00.948Z. 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 | Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM; Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 NM; 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 |
| Headline | Special Marine Warning issued June 18 at 8:08PM EDT until June 18 at 9:45PM EDT by NWS Charleston SC |
| Expires | 2026-06-18T21:45:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cf1e368877faf930748afaefcc74379b9c3f8e22.001.1","noaa_urn:oid:2.49.0.1.840.0.6aac252440ce7d22fa29fa7191bf07492eba3218.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 49 |
| Iem Unit | mph |
| Iem City | 6 WSW Forest Beach |
| Iem County | AMZ362 |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Wxflow station at Calibogue Sound reported a peak wind gusts of 43 kts. |
| MergedSources | [{"id":"iem_E_32.030_-81.090_1781818020000","source":"iem","severity":"low","severityValue":25,"timestamp":1781818020000,"latitude":32.03,"longitude":-81.09},{"id":"iem_M_32.110_-80.840_1781815140000","source":"iem","severity":"low","severityValue":25,"timestamp":1781815140000,"latitude":32.11,"longitude":-80.84}] |
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.
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