"My experience is that some pilots don't fully understand the true significance of a sudden outside air temperature rise (and yes they do occur - I have seen temperature rises of 20-30 degrees)."
Bleve,
Not to doubt you, but where have you experienced such large changes at the higher flight levels such as FL350? I would also think you are talking in C as only us stubborn Americans think regularly in F (they force me to use C when flying). In my experience at the higher levels, maybe I have seen a change of 3 to 4 degrees C at a constant FL over a lapse of time. Of course, if you are in the middle of a big CB, you are no longer at any one flight level for any period of time. I think I would like to avoid areas prone to 30 degree changes.
To me, 40C isn't hot but 104F is cooking. Oh wait, they are the same.
