Cloud on the hills

[mtbc]

Our village lies on an alluvial plain with the the river to the south and the Sidlaws to the north. As I look north to those hills I often see low cloud or mist hanging over them. One science of which I know very little is meteorology: I don't know if the hills cause the cloud or attract it or what, nor do I know if their position with respect to the river and the plain and the prevailing winds is a relevant factor.