Why is an electrical storm dangerous?

Answer 1

Assuming that you mean a thunder and lightning storm, it is dangerous to swim because water is a conductor to electricity similarly to metal. If the storm is close, meaning you can see the lightning, you should get out of the pool immediately because it is possible that lightning will strike the pool.

Answer 2

Being hit by lightning it bad enough because of the waves of electricity harming cells but its more dangerous when in a swimming pool. Mainly because the pool would amplify(make more extreme) the effect of the lightning

Answer 3

You could be electrocuted.