During which condition does lightning present the greatest hazard to crane operations?

The greatest hazard to crane operations during thunder and lightning is due to the risk of electrical strikes, which can be catastrophic for both the equipment and personnel involved. Lightning is associated with severe weather conditions that can create dangerous situations, such as high winds, heavy rain, and poor visibility. When thunder and lightning are present, it indicates that there is an ongoing electrical storm, which poses an immediate risk to cranes, especially if they are tall and made of conductive materials.

During such conditions, the likelihood of lightning strikes increases significantly, as cranes can act as lightning rods due to their height. Additionally, the vibrations and noise from nearby thunder can also distract operators, further complicating safe crane operations. For these reasons, conducting crane activities in conditions where thunder and lightning are present is highly discouraged and is considered to carry the highest hazard level compared to other weather conditions.