Red Sky, A Warning?

This was just outside my work (the flat roof on the left) this morning, I figured I'd only be a minute or two late. Not a problem.

However this evening I have found my wallet is missing and am frantically cancelling cards. I don't think it's stolen but I just can't find the bugger. I've never lost a wallet (or keys) before in my life - not a good experience and a big problem.

I was warned ...albeit about the weather, which has been wet and rank all day.