Jets don’t decide whether to leave a contrail or not — it just happens. The hot jet exhaust interacts with the lower-temperature atmosphere, and contrails form. Scientific American states that the “nature and persistence of jet contrails can be used to predict the weather… thin, short-lived contrail…a sign of fair weather…whereas a thick, long-lasting contrail…can be an early indicator of a storm.” I am leaving wakes all day, every day as I interact with people and things. What is the nature of the wake I leave? Am I going for persistence in what I leave behind?