The Cool Lightning Strike Scar: A Testament to Nature's Fury

At Melbourne University's Burnley Campus, a stunning variegated elm stands tall, its bark bearing witness to the fury of nature in the form of a lightning strike scar that dates back almost three decades. The tree's resilience is a testament to the power of adaptation and regeneration in the face of adversity.

Lightning strikes can be devastating, with temperatures reaching up to 20,000°C and voltages exceeding a million. When a tree is struck by lightning, it can cause catastrophic damage, leading to explosions or loss of large strips of wood and bark. The effects of such an event depend on various factors, including the tree species, type of lightning, moisture levels, and where the strike hits the earth.

The elm at Burnley Campus is a prime example of how trees can recover from lightning strikes if the damage is not too severe. Over time, the wood behind the scar may decay, leaving a hollow behind. The scar itself becomes visible, often running along a large branch, vertically down the trunk, or ending just above the ground.

Interestingly, not all lightning strikes result in catastrophic damage. If a tree's trunk is wet from rain, the electricity can course through the water and dust on the trunk down to the earth, causing minimal harm to the tree itself. However, it's essential to avoid standing under a tree during a thunderstorm, as trees are poor conductors of electricity.

The recent spate of severe storms in Australia has highlighted the importance of old trees being hit more often due to their tall stature and the increasing frequency of storm events. Climate change is expected to lead to more frequent and intense lightning strikes, making it crucial for us to understand how these events impact our environment.

As we navigate the changing climate, it's essential to recognize the role that old trees play in our ecosystem and take steps to preserve them. By doing so, we can ensure that future generations continue to benefit from the beauty and resilience of these natural wonders.

Cool lightning strike scar