Dashed contrail. You can really see that it appears and disappears with the same atmospheric conditions influencing natural cloud formation. Dashed contrail. You can really see that it appears and disappears with the same atmospheric conditions influencing natural cloud formation. Related Posts:A stark reminder that local conditions, remote conditions, and…I guess it makes sense that only the biggest cloud providers…Nothing says "Christmas" quite like a platoon of Stormtroopers…Blaming mental illness for *any* problem won't solve it if all…