Heavy weather is defined as wave height exceeding 8 feet or winds exceeding what speed in knots?

• A. 25 knots
• B. 30 knots
• C. 35 knots
• D. 40 knots

Answer: (B)

Heavy weather is declared when conditions create notably rough seas and challenging ship handling, which is tied to a sustained wind speed threshold. The standard limit used is 30 knots for winds; when winds are sustained at or above this level, sea states are considered heavy weather, especially alongside waves around 8 feet or taller. In other words, 30 knots is the practical cutoff at which winds generate sufficiently large seas to require added precautions and procedures.

As a quick check, winds around 25 knots are strong but typically not classified as heavy weather, while winds at 35 or 40 knots indicate storms or worse conditions beyond the heavy-weather threshold.