It's typically in autumn evenings and into early mornings, very rarely also in winter. It's like the could dragons depicted in ancient Chinese pictures, a long cloud formation sneaking along the hillside and into and out of the valleys, that is why it is called the Maloja snake. It's caused by the Maloja wind, a strong and regular wind between the Maloja pass and the valley barrier in S-chanf. If you want to have more information about this penomeneon, see https://www.fuw.ch/die-schlange-im-engadin-813135427501 - have google translate it.

Have seen it frequently in September from the Samedan golf course. . It is lovely (could do without its name of Malojaslange…). Don’t like snakes!