Right now
The most recent data we hold from NOAA arrived 74 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 10 July 2026 at 01:45 UTC. It is kept here as a record.
It is the 8th strongest of the 40 detections recorded within 20 km of this point since 2 June 2026. The last comparable one was on 24 June 2026.
What the source measured
NOAA reported: Special Marine Warning issued July 9 at 8:46PM EDT until July 9 at 9:45PM EDT by NWS Charleston SC
Urban PEI: 94,339 within a heuristic 50 km radius; not unique people.
Nearby, since 2 June 2026
- July 10, 2026 · score 39 · 0.0 km
- August 28, 2026 · score 39 · 2.1 km
- August 10, 2026 · score 39 · 3.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 32.2862, -80.4395 |
| Nearest City | Hilton Head (30 km) |
| Urban exposure index (PEI) | 94.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-10T00:46:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ff423590c9b47ca3eaf61d452c7da61af3aa92ee.001.1 |
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: 2026-07-10T00:46:00.000Z.
First archived: 2026-07-10T01:06:21.490Z. 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 South Santee River to Edisto Beach SC out 20 NM; Coastal waters from Edisto Beach SC to Savannah GA out 20 NM; Coastal waters from Savannah GA to Altamaha Sound GA out 20 nm, including Grays Reef National Marine Sanctuary; Waters from South Santee River SC to Edisto Beach SC extending from 20 to 60 NM; Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued July 9 at 8:46PM EDT until July 9 at 9:45PM EDT by NWS Charleston SC |
| Expires | 2026-07-09T21:45:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
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.
Review the area, threshold and delivery channel in your account.
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