Capsize

Capsize describes a vessel overturning in the water, either onto its side or completely upside down, after losing stability. It can affect dinghies, keelboats, multihulls and powerboats, and may be caused by excessive heel, breaking waves, sudden crew or cargo movement, flooding, or a failure to reduce sail or speed in time.

For boaters, capsize risk shapes passage planning, sail choice, loading and watchkeeping. Monitoring Sea State, Wind Gust and the interaction of waves with current helps crews avoid conditions where stability margins shrink. Wearing a Life Jacket, securing loose gear and briefing recovery actions are essential precautions.

PredictWind forecasts support capsize prevention by showing wind, gust and wave trends before departure and during a voyage. The Offshore App, GRIB downloads and Weather Routing help identify safer timing, headings or shelter options when heavy weather could make a route unsuitable.