Here's a different type of asymmetry, in a more developed contrail today.
Yes, correct. Is there a way to further explain the visual appearance of that particular contrail (and of course, by 'extension', the wide variety seen in other observed contrails?). And? Can a thread (or discussion in this thread) help to further explain, and hopefully illustrate what is "invisible" to most....(since our atmosphere {the "air"} is a transparent...to our eyes...gas).
Only when condensation events ("aka' clouds, etc") are formed do we Humans get a (visual) sense of the processes aloft. (Or on the ground, if we consider "fog" too....which is basically low-level stratus).
I mention this only to open a discussion about the incredible complexity and diversity
of Earth's atmosphere.
Point being that in each-and-every condensation event, in the Earth's atmosphere? There can be significant variations....even sudden "shifts" in temperature/humidity conditions....(a "shear-effect", if that helps to understand).
I would wish for the audience to consider (...if they have never experienced "White-Water-Rafting" then this might not make sense.)
But....water as a fluid behaves similarly to air.....as each is a type of "fluid" (in science) and each flows. A "White-Water-Raft" experience on
any particular river usually is rather "consistent" because the water is flowing over a well-defined surface....the river-bed. This means that the behavior of that water is easily understood (based on the the flow-rate OF the river, AND the substrate of the river-bed, of course.).
Over centuries, due to erosion and other geographical factors, a rivers' "Way of Flow" will change.....but usually not within one Human's lifetime.
The Earth's atmosphere, however, is VERY different when compared to a flow of water in a river channel. The fluid dynamic physics are similar of course....but the ATMOSPHERE of Earth has no physical constraints...(except I will mention some geographical physical terrain implications.....such as mountainous variations in the height of the Earth's surface....for just ONE example!).
To "summarize"? Any apparent "assemetry" in observed formed contrails can occur...merely because the Earth's atmosphere is "assymetric".