Which weather and sea-state conditions would typically justify canceling or postponing a dive?

• A. Conditions exceeding site-approved limits: high waves, strong currents, poor visibility, lightning, or forecasted bad weather that exceeds plan.
• B. Any weather is fine if the dive plan is robust.
• C. Gentle seas but high temperature is disqualifying.
• D. Only lightning during night dives.

Answer: (A)

Diving safely depends on keeping weather and sea-state within the site’s approved limits. When conditions exceed those limits—high waves, strong currents, poor visibility, lightning, or forecasted bad weather—the hazards become unacceptable and the prudent action is to cancel or postpone. A dive plan can’t remove these physical dangers, and certain factors like heat alone don’t automatically justify cancellation. Lightning is a serious risk at any time, but the key decision is whether the overall conditions exceed the established safety limits for the site.