Although there may be no outward signs of electrical shock, trees may die suddenly from burned roots or internal damage. Or trees may show external damage immediately. Tall trees growing in open areas or along riverbanks are most vulnerable. In some instances, deep-rooted species and decaying trees may be more prone to lightning injury than shallow-rooted species or healthy trees. Lightning tends to strike oak, maple, pine, and tulip poplar trees first. Trees not as susceptible to lightning injury are birch, beech and horsechestnut.
Trees may burst into flame during an electrical storm. Tops of trees or branches may explode, leaving a jagged stub. A piece of bark may be burned or stripped from the entire length of the tree. Part or all of the tree suddenly may turn brown and die.
Some trees may recover from lightning strike. To help a tree in this process, remove all lose and injured tree bark. Water well, and fertilize adequately for the tree variety.