The Front Line

This delightful weather feature must have stretched at least as far as Cambridge, perhaps Norwich, perhaps the West Frisian Islands.
Sky is so difficult to measure, especially in a flat landscape. 
A moment later the underside turned a delicious shade of pink, but by then I was in a place where I couldn't catch the full sweep - little boxy houses limiting the view. 
They're no help when it comes to measuring sky.
Stupidity is similarly difficult to measure.