First Sign

Usually, the first sign of a front moving in is an increase in high cirrus clouds (and subsequently, commercial jet condensation trails).



Why? As the air becomes more saturated with moisture above 5 miles high, that moisture now has condensation nuclei on which to condense. That’s why we call them “contrails” (short for condensation trails). And, NO, these are NOT “chemtrails.” As someone who worked in the commercial airline industry as a meteorologist for then Northwest Airlines, I can reassure you that you are seeing artifacts of commercial aircraft between 25,000 and 37,000 feet.

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