PhD Chemist Whistleblower, Worked 17 Years Developing Chemtrails: 90% of Chemtrails Designed to Alter Emotions/Mood/State of Mind and Provoke “Flu-like Symptoms”

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Here's the relative humidity at about 9km altitude.

https://www.instantweathermaps.com/GFS-php/euroupper.php?run=2024011012&var=RH&lev=300mb&hour=000

Relative humidity is the amount of water vapor in the air at a given moment as compared to the maximum amount of water vapor that air at the pressure and temperature that it is at can typically hold. On our weather maps, relative humidity is given as a percentage.

high humidity = persistent contrails,
low humididity = contrails that disappear quickly)

Here's another one with forecasting which can be used to predict when contrails will become persistent or not.

Looks like the UK will remain trail-free for quite a few days