On Friday, August 25, 2017 at 11:13:23 AM UTC-4, John Cochrane wrote:
I got to fly in one in New Zealand, with Gavin in the back....
-- a hill, lenticular cap cloud, gap, then sort of a wall of turbulent cloud.

Cool! Did the wall look like the picture in Bernard's article?
What was the discontinuity that provoked the jump?