What is the foehn effect?

When air passes over mountains, the valleys on the downwind side (or 'lee' side) commonly experience strong and gusty downslope winds accompanied by abrupt warming and drying. These are known as foehn winds, and their warming and drying effect - the foehn effect - can be striking and far-reaching.

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[rogtallbloke]

The MET-O seems to have forgotten to mention adiabatic cooling and heating in this explanation. Air forced up expands, reduces in pressure and cools to below dew point, clouds form. On the leeward side, air descends, is compressed in the higher pressure surroundings and warms.

[abrilmontoyamorales]

Good afternoon, excuse me I could use two of your video for a school project, we will grab your video as a guide to guide us.

[TheGeoScholar]

I have a video about the foehn on my channel.

[stevejh]

Probably the WORST explanation of Fohn effect I have ever seen. And you call yourself the MetOffice!
Did you forget lapse rates.
Forgetting lapse rate but suggesting the main reason for the increase in warmth on the leeward side is the sun, so how does this happen when significantly overcast?
Take down this terrible video and stop calling yourself the MET OFFICE!