Clouds after a bloody hot two days

As I was driving home from a run today the thermometer in the car showed 39.5oC.  However a hopeful sign was that clouds were building up, getting close to lenticular formation. This article offers a fair - if somewhat US-oriented - explanation of their genesis.



 This was more like a wave cloud, but I think formed through much the same process.
At home much pf the sky was covered with general stratus cloud, with some high level cirrus visible through the gaps.
 An unusual shape.



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