In this YouTube video of jet fighter aircraft flying in Death Valley, wingtip vortices are clearly visible at the 2:47 mark. They also make a brief appearance right after the 2:25 mark. Vortices become visible because the temperature drop causes the water vapor in the air to condense. But isn't the humidity in Death Valley like below zero? Actually there is some humidity there, like 10% today. On occasion it can get above 50%. So maybe this was a high humidity day.
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