From "The Guardian" newspaper (UK) (and well-documented elsewhere):

Nagasaki might have escaped destruction had it not been for the weather. Bock's Car, the US plane that dropped the bomb, had headed for nearby Kokura on the morning of August 9, but did not release its payload because the city was shrouded in haze.

The crew flew on to Nagasaki only to find it was covered in thick cloud, and were on the verge of abandoning their mission when an opening appeared.

A clear case of careful military planning or vagaries of the weather?

From the last post:

I have yet to see proof that it was not justified.

All the "cold hard facts" quoted about what would have happened had the bombs not been dropped are, in fact, hypothetical as they did not happen. Therefore there will and can never be "proof" on this. We are therefore left with our beliefs and ethical positions about the rights or wrongs of the matter.

Peace

moo