Actually, thunderstorms, while they may seem to cover up space battles, it is unintentional. The spaceships zoom into place, and when they stop, they let out a lot of smoke from their flame boosters, covering up the sky. You cannot see them before the clouds roll around, since they have their cloaking devices on in an attempt to surprise each other, this being the reason the "clouds" from the ship can roll around long before a thunderstorm, since they do not start battling until they find each other. Lightning comes in many forms, but actually, they are simply different types of electrical explosion attacks. Ball lightning is like dropping bombs over the enemy spaceship, except due to being made of electricity they move towards the enemy due to their ship being metal. It takes a lot of power to create this and thus can only be used once without a spaceship recharge station, making it dangerous to use since the ship may lose power and float through space until it lands on something. It is also extremely difficult to avoid, meaning it will rarely ever fall down to Earth. Sheet lightning is caused by landing a successful hit, making an explosion-like effect. Fork lightning is the main attack of most, if not all, spaceships that can make use of it, homing in on the enemy in a rather effective way. It is shot from the bottom of the ship, and must be used when above or close to the enemy, otherwise it will hit Earth. A supercell storm is when a powerful Kōsoku Supēsu of the Cosmic Japanese Army, or other similar hyper-spaceship, is destroyed. The entire ship becomes pure electricity, which then compresses into a smaller, non-hollow mass of electricity, killing everyone inside. The cooling ice, which goes below ultimate zero at coldest, remains intact inside the mass, which then heads towards the Earth, and pulls clouds down with it when reaching the cloud layer. The clouds stop it from getting too near Earth, and the cooling ice goes to temperatures of regular ice, before being flung out in small chunks that are a little less than the size of a golf ball on average.