Descending air in the atmosphere rises in temperature as it is adiabatically compressed in the pressure gradient created by gravity acting on atmospheric mass. This has been known for centuries. However, the MET Office has decided to do away with this fundamental fact of physics in a short video it has produced.
Even their own website page on the Foehn effect (now safely screenshotted and web-cited) tells us:
“ foehn air… becomes warmer and drier on the leeside after it is compressed with descent due to the increase in pressure towards the surface.”
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