Marine Thunderstorm Wind — Charleston Harbor, Atlantic South
2025-08-01 · near Fort Sumter, Charleston Harbor, Atlantic South
40 MG
Magnitude
Event narrative
The Weatherflow sensor at Fort Sumter Range Front Light measured wind gusts of at least 34 knots between 935 PM and 945 PM with a peak wind gust of 40 knots at 940 PM.
Wider weather episode
A weak warm front passing across the area encountered deep moisture, warm temperatures and large downdraft CAPE, favoring strong to severe thunderstorms across coastal waters.
View location on OpenStreetMap → (32.7512, -79.8707)
Source: NOAA Storm Events Database, event_id 1291068. Narrative written by the NWS forecast office that issued the report.