When a lightning strikes

When a lightning strikes, a tree can be split to half.
When a lightning strikes, electrical and machines can shut down.
When a lightning strikes, the sky gets darks.
When a lightning strikes, little children close their ears and run to their mummies.
Yet, after lightning, there's always the thunder.

The lightning is there to warn that a thunder is on its way.

What is the lightning in this situation now??

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