This alert expired on 24 June 2026 at 16:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 39 detections recorded within 20 km of this point since 11 May 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 24 at 10:34AM EDT until June 24 at 12:30PM EDT by NWS Charleston SC
An estimated 109,477 people live within 50 km of this point.
Nearby, since 11 May 2026
- August 3, 2026 · score 39 · 1.1 km
- July 10, 2026 · score 39 · 1.7 km
- June 2, 2026 · score 43 · 4.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 86 % 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) | 43 / 100 |
| Our confidence | 86% |
| Coordinates | 32.2433, -80.5338 |
| Nearest City | Hilton Head Island (20 km) |
| Population Exposed | 109.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-24T14:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e7609772f57b2acb3c3ef865aa5ddbef5c0d029a.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coastal waters from Edisto Beach SC to Savannah GA out 20 NM; Waters from Edisto Beach SC to Savannah GA extending from 20 to 60 NM |
| Headline | Special Marine Warning issued June 24 at 10:34AM EDT until June 24 at 12:30PM EDT by NWS Charleston SC |
| Expires | 2026-06-24T12:30:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | W |
| Iem City | 7 ESE Folly Field |
| Iem County | AMZ362 |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | Shore Beach Service reported a waterspout offshore of beach marker 93a and the Singleton Beach area. |
| MergedSources | [{"id":"iem_W_32.180_-80.580_1782310500000","source":"iem","severity":"low","severityValue":25,"timestamp":1782310500000,"latitude":32.18,"longitude":-80.58}] |
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 43/100, 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.