What Happens To Trees When They’re Struck by Lightning

There’s a moment in SEETHINGS where a storm stops being background atmosphere and takes centre stage.

A group of friends, finishing dinner on a ridge at Belvedere, watch a storm build across a valley—initially as observers, detached and comfortable to enjoy the light show. That distance collapses the instant lightning strikes a nearby tree.

What follows isn’t just dramatic tension. It’s grounded in real physics.

This post exists to unpack that moment—not by retelling it, but by examining what actually happens when lightning hits a tree, and why the outcome in the scene feels as violent and chaotic as it does.

The Setup: Why Trees Get Hit

Lightning isn’t random. It’s opportunistic.

It seeks the fastest, most conductive path between cloud and ground, and tall objects become natural targets. Trees are particularly vulnerable because they combine three important features:

• Height – they extend upward into the electrical field
• Moisture content – internal water and sap conduct electricity
• Direct grounding – roots provide a path into the earth

From a physics standpoint, a tree is an ideal conduit.

In the SEETHINGS scene, the tree near the ridge-line house becomes that conduit—not because it’s chosen, but because it’s available.

What Happens at the Moment of Strike

A lightning bolt carries an immense amount of energy. Temperatures within the channel can exceed 30,000°C, hotter than the surface of the sun.

When that energy enters a tree, it doesn’t gently disperse.

It forces an immediate reaction inside the trunk.

1. Rapid Superheating

The tree’s internal moisture—water stored in cells and sap channels—is suddenly exposed to extreme heat. There is no time for gradual warming. The temperature spike is instantaneous.

2. Flash Conversion to Steam

Water expands dramatically when it becomes steam. Under normal conditions, this is controlled and gradual. Inside a tree struck by lightning, it is neither.

The conversion happens in a fraction of a second.

3. Pressure Build-Up

The expanding steam has nowhere to go. The wood fibres surrounding it act like a sealed container. Pressure rises rapidly, exceeding the structural limits of the trunk.

4. Structural Failure

At that point, the tree doesn’t simply crack—it ruptures.

This is why eyewitness accounts often describe lightning-struck trees as having “exploded.” The term isn’t metaphorical. It’s a direct result of internal pressure exceeding the material’s capacity.

The “Explosion” Effect

One common misconception is that lightning primarily burns trees.

In reality, the explosive force is often the first and most dramatic outcome.

• Bark can be stripped off in long vertical sections
• The trunk can split open from top to bottom
• Sections of wood can be violently ejected outward

These ejected fragments are not passive debris. They can be:

• Fast-moving
• Irregular in shape
• Extremely hot (due to the heat of the strike)

In the context of the SEETHINGS scene, the description of projectiles radiating outward from the strike point aligns directly with this mechanism. The tree effectively becomes a source of shrapnel.

That detail matters because it transforms the event from a visual spectacle into an immediate physical threat.

Secondary Effects: Fire Isn’t Always Immediate

While lightning can ignite fires, it doesn’t always do so instantly or visibly.

Instead:

• Heat can become trapped within the trunk
• Internal burning can continue without obvious flames
• The tree may begin to smoulder, only igniting later

This delayed combustion is common, particularly in trees with dense or resin-rich wood.

So while an explosion may be the first visible effect, fire is often the lingering consequence—sometimes unnoticed until well after the strike.

Electrical Pathways and Damage Beyond the Trunk

Electricity doesn’t move randomly through the tree. It follows conductive pathways:

• Sap channels
• Moist inner wood layers
• Surface moisture along the bark

This can result in:

• Long vertical scars running down the trunk
• Damage to branches and limbs
• Electrical discharge into the root system, affecting surrounding soil

In some cases, the energy exits through the ground, potentially impacting nearby structures, wiring, or even people in close proximity.

That’s an important extension of the scene: the danger isn’t limited to the tree itself.

Why Debris Becomes Dangerous

The idea of wood fragments acting as projectiles might seem exaggerated at first glance, but it’s a well-documented outcome.

When the trunk ruptures:

• Internal pressure releases outward in all directions
• The weakest points in the structure fail first
• Pieces of wood are propelled away from the strike zone

Unlike falling branches, these fragments are launched, not dropped.

Their trajectory is unpredictable, and their temperature can be high enough to cause burns on contact. Combined with speed and irregular shape, they become hazardous in the same way any high-velocity debris would be.

This explains how a lightning strike can result in injuries at a distance from the tree itself, as seen in the chapter.

The Role of the Storm Around the Strike

The lightning strike doesn’t occur in isolation.

In SEETHINGS, it’s part of a broader storm system—one that includes hail, wind, and structural damage to the home. That layering is important because severe storms often combine multiple destructive elements:

Hail

• Forms in strong updrafts within storm clouds
• Can reach a significant size and velocity
• Causes damage to windows, roofing, and exposed surfaces

Wind

• Driven by pressure gradients and storm dynamics
• Exploits structural weaknesses
• Can cause progressive failure once a building is compromised

Power Failure

• Lightning can disrupt electrical systems
• Surges can damage circuits
• Outages remove visibility and increase confusion during emergencies

The sequence described in the chapter—strike, injury, blackout, followed by escalating storm damage—is consistent with how these systems behave in reality.

From Observation to Exposure

One of the most effective aspects of the scene isn’t the strike itself, but the shift it creates.

Before the strike, the group is watching the storm. They are:

• Elevated
• Sheltered
• Detached

After the strike, those conditions no longer apply.

The physics of the event forces a change in perspective. What was distant becomes immediate. What was safe becomes compromised.

The scientific explanation reinforces this shift. Lightning doesn’t gradually introduce danger—it redefines the environment in an instant.

Why the Scene Works

The power of that moment in SEETHINGS comes from its grounding in reality.

Nothing about the tree’s destruction requires exaggeration:

• The explosion is a function of steam expansion
• The debris is a result of structural failure under pressure
• The injury is a consequence of high-velocity fragments
• The blackout and storm escalation follow naturally from the same system

Understanding the mechanics doesn’t reduce the impact of the scene—it intensifies it.

Because it removes the sense that this is fiction, stretching reality.

Instead, it becomes something more unsettling:

entirely plausible.

The Takeaway

When lightning strikes a tree, the outcome is determined by physics, not drama:

• Extreme heat converts internal moisture to steam
• Rapid expansion creates internal pressure
• The structure fails, often explosively
• Debris can be propelled outward at speed
• Fire and internal damage may follow

Placed within a storm system, that single event becomes part of a chain reaction—one that can extend beyond the tree to affect buildings, people, and the surrounding environment.

That’s the foundation the SEETHINGS scene builds on.

Not exaggeration.

Just the reality of what happens when energy, structure, and pressure collide in the wrong place at the wrong time.

–Michael (Dark fiction. Author of SEETHINGS (the first book), free for a limited time)