In reply to Phil: at the beginning I was roughly at the same spot than you, but I finally decided to head north, after the reliefs, on the same Highway. I was in the "opposite" side of the central line, about 40km north from you.
Here is a picture I have taken from this spot. I attached the same image with what I consider as your cloud which obscured your view. Considering the geometry of the scene and the shape of the cloud, this seems very likely this is "your" cloud.
From my spot, the sun was ideally placed between two layers of cirrus (yours and another one on the left), we had a lot of chance. Maybe they could be seen on satellite images.
I've attached a map of our approximate positions (as far as I understood yours).
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