I think these pictures say it for themselves, don’t you?
For some reason, the clouds to the east usually look better than the actual sunset!
The first time I came across a hail curtain I didn’t actually have a clue what it was, so I emailed a weather website to ask. Since then, I’ve spotted several of these – they seem more striking when the sunlight is behind me, against stormy dark clouds.
Mackerel sky and mare’s tails make tall ships carry low sails
That’s not actually a weather saying I’d heard of before, but apparently both types of cloud can develop before a storm, hence the shops using low sails.
Mackerel Sky relates to altocumulus clouds, getting its name from the likeness of the cloud formation to the scales on a Mackerel.