Why is it dangerous to swim during a storm?
If lightning strikes and u r in water, then u could possibly get electrocuted.
The main reason is that during a storm there is often rain and heavy winds, the rain would generally be colder and could lower your core body temperature if you stayed out in it too long, it would also render it harder to see if it was heavy. The main concern though is the wind as you would have to fight against waves which could include whitecaps and the current of the water. It would tire you out very fast and there is a strong risk that you could drown.
VERY VERY DANGEROUS!!!!!!!!! Never ever swim during a storm!!! Because lighting is attracted to tree's and water, I learned this in Science. If you were swimming during a lightning storm, and lightning happed to strike the water, you would get electrified and you would die. So yes, it is very dangerous, and you shouldn't ever do it.
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.