This alert expired on 27 August 2026 at 12:00 UTC. It is kept here as a record.
It is the 20th strongest of the 34 detections recorded within 20 km of this point since 8 March 2026. The last comparable one was on 7 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued August 27 at 7:25AM EDT until August 27 at 8:00AM EDT by NWS Charleston SC
An estimated 340,227 people live within 50 km of this point.
Nearby, since 8 March 2026
- August 6, 2026 · score 43 · 4.2 km
- July 30, 2026 · score 43 · 11.7 km
- August 2, 2026 · score 43 · 14.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 92 % 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) | 37 / 100 |
| Our confidence | 92% |
| Coordinates | 32.6789, -79.5878 |
| Nearest City | Mount Pleasant (28 km) |
| Population Exposed | 340.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T11:25:00.000Z |
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 |
| Headline | Special Marine Warning issued August 27 at 7:25AM EDT until August 27 at 8:00AM EDT by NWS Charleston SC |
| Expires | 2026-08-27T08:00:00-04:00 |
| SenderName | NWS Charleston SC |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 39 |
| Iem Unit | mph |
| Iem City | 2 WSW Folly Beach |
| Iem County | Charleston |
| Iem State | SC |
| Iem Wfo | CHS |
| Iem Remark | The Folly South End, XFSE, reported a peak wind gusts of 34 kts. |
| MergedSources | [{"id":"iem_M_32.750_-79.870_1787812380000","source":"iem","severity":"low","severityValue":25,"timestamp":1787812380000,"latitude":32.75,"longitude":-79.87},{"id":"iem_M_32.640_-79.970_1787811000000","source":"iem","severity":"low","severityValue":25,"timestamp":1787811000000,"latitude":32.64,"longitude":-79.97}] |
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.
Calamity.live data shows a weather event with CalamityScore 37/100, near Mount Pleasant (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.