During what weather condition should sailors be cautious of lightning strikes?

Sailors should be particularly cautious of lightning strikes during thunderstorms. Thunderstorms are associated with the presence of cumulonimbus clouds, which are capable of producing severe weather phenomena, including intense lightning activity. The energy within these storms can lead to frequent lightning discharge, posing significant risks to anyone on the water.

Although heavy rain can occur without a thunderstorm, the risk of lightning is primarily linked to the presence of thunderstorm activity. Clear skies typically indicate stable weather conditions with minimal risk of lightning, and high humidity alone does not directly correlate with thunderstorms or increased lightning risk. In summary, thunderstorms are the most dangerous conditions for sailors regarding electrical activity from lightning.