The report:
https://www.bea.aero/docspa/2012/hb-...z120824.en.pdf
I knew this pilot. He once poured scorn on me for turning back in my Super Cub from a cloudy valley through the Jura. He said that in an aircraft like mine I should have pressed on and tried to pick my way through.
"What a pillock," I thought, and vowed never to fly with him.