Additional types of damage….
SIDEFLASH – When lightning strikes an unprotected tree, it may travel along the stem for distance, or it could “JUMP” to a more conductive tree, structure, animal or person. This jumping phenomenon is called “sideflash” and can cause serious damage to structures– potentially starting fires or damaging electrical systems and appliances. It can be responsible for the death, or injury to the tree, and even result in the injury or death of people and animals taking refuge beneath the tree.
STEP VOLTAGE – Lightning exits an unprotected tree through the roots and lower stem, and dissipates energy into the soil. At the soil surface, a great difference in the electrical potential exists as the charge spreads out. This difference is called ‘step voltage.” If people or animals are standing in the area, a potentially deadly flow of electricity may go up one leg and down the other. On trees with lightning protection systems, step voltage should be greatly reduced but still may occur.