depends wat kind of lightning u want...u prolly can...do u want the doodad>cinematic lightning or like a big storm lightning...just a big flash in screen..?
so do a spell like firestorm, but remove the art
then, determine the area of effect and run a loop with a short wait period creating that special effect at a random angle, (random number between 0 and the AOE of the spell) away from the target of the spell