A storm cloud appears in the shape of a cylinder that is 10 feet tall with a 60-foot radius, centered on a point you can see 100 feet directly above you. The spell fails if you can’t see a point in the air where the storm cloud could appear (for example, if you are in a room that can’t accommodate the cloud).
This spell works by gathering all of the storm clouds in the area and increases the static in the air, thus increasing all lightning damage dealt within the confines of this area effect does an additional 1d8 damage. All creatures in this area gain this bonus to lightning damage regardless of who they are, your companions or those fighting against you.
If this spell is cast at a higher level the damage is increased by an additional 1d8, thus 2nd level (2d8 bonus), 3rd level (3d8), etc..