Board Thread:Naruto Discussions/@comment-25409224-20140913064011/@comment-25525100-20141012103244

@sumandark8600

Who said that fire dragon justu is enough.. Watch naruto shippuden 138, black zetsu said "I see so sasuke's earlier fire jutsu was not for itachi to begain with, he used fire style to create a fomilo limbus(or some thing like that) means thundercloud, and he purposly lore itachi out side So he could use heat generated by the amatarasu..."

And what I belive is it is not necessary that it has to begain with amatarasu, any fire style should do the trick but on a large scale to heat up the atmosphere and then use the fire jutsu towards the sky to rise the temperature rapidly... And the reason rarin can not b used so offen is the set-up requries a huge fire style in 2 steps (1st to heat up the atmosphere and 2- to heat up the sky) and huge fire style requires a good amount of chakara and after the set-up you cannt tell where it will start to rain and thundercloud will b created coz atmosphere's temprature, humidity, moisture etc are the plan changer...