Violent Storm
The Beaufort force 11 wind description, corresponding to mean wind speeds of 56–63 knots.
Exceptionally high waves may hide small and medium-sized vessels from view, while foam and spray greatly reduce visibility. Such conditions are extremely hazardous and are rarely encountered by small craft operating prudently.
The Beaufort force is based on wind speed and characteristic effects. Wave development can differ with fetch, duration, depth, current and proximity to land.


