I don't know if this is concrete enough for a whole post or if you may have already done something similar, but--one of the things that I simultaneously admire greatly and envy the crap out of is your facility with evoking atmosphere. Do you have a specific spot in the drafting process when you do that--like a late draft thing--or is the tone/mood/atmosphere of the place your characters are (mentally and physically) something that is present for you from the time you start drafting? Is it word choice, or rhythm, or all of the above.

I don't know if that question even makes sense. But the mood and atmosphere of your settings and situations always seems so tangible and right for the story at that point--you evoke dread, or oppression, or chaos, longing, sadness, etc., so well and it's something I struggle with.