This alert expired on 10 July 2026 at 01:45 UTC. It is kept here as a record.
It is the 13th strongest of the 40 detections recorded within 20 km of this point since 11 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 9 at 9:18PM EDT until July 9 at 9:45PM EDT by NWS Charleston SC
An estimated 94,339 people live within 50 km of this point.
Nearby, since 11 May 2026
- August 3, 2026 · score 39 · 0.7 km
- June 24, 2026 · score 43 · 1.7 km
- June 2, 2026 · score 43 · 5.9 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, at 80 % 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) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 32.2515, -80.5180 |
| Nearest City | Hilton Head Island (22 km) |
| Population Exposed | 94.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-10T01:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0d0d35ddaa6f78b950137a51247727b6e0a46788.002.1 |
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 Edisto Beach SC to Savannah GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued July 9 at 9:18PM 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 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 Hilton Head Island?
Calamity.live data shows a weather event with CalamityScore 39/100, near Hilton Head Island (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.