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Jetstream is a stream of air that can travel up to 300kmm/ hour. It is just the air not the cloud. High cloud has all sorts of causes, when people talk about the jet stream they are referring to the stream of air, whether it is not in the area of if it is how violent it will be. On clear nights the jet stream can affect the stability of the seeing. It can make the image dance around like it is in a washing mashing machine.
Hope that clears that up.
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