Contrail persistence depends heavily on relative humidity at altitude.. and atmospheric layers can vary a lot over just a few thousand feet.

Roger on July 19, 2025 172 views

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Contrail persistence depends heavily on relative humidity at altitude.. and atmospheric layers can vary a lot over just a few thousand feet. So if you see a jet at 38,000ft leaving a short lived or fading contrail, and another at 34,000ft leaving a long, spreading one, here’s what’s likely happenin... View More

July 19, 2025

Rick Elgin

I have to laugh at these people who think that these jets have a compartment and chemicals are dispersed into the atmosphere as these jets criss cross the sky.

1 July 20, 2025 Edited