- no jetstream visible
I assume this means contrails? (The "jet stream" normally refers to the strong west winds above the tropopause in the middle latitudes of the northern hemisphere).
... which is often, roughly, the boundary between cold air from the pole and warm air from the equator.
SSG already has support for smoke, etc., with drift, though I don't remember the name of the class.
All the best,
David
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