Been watching them for at least 10 years now.. They seem to be out all the time. The strange part is we live we at the far north end next to the Mountains in Shasta County. They only spay over the cities. You can see where the mountains are, their trails stop. That's three sides the mountains cover north, east, and west.. Everybody reading know what they look like.. Here, they seem to widen with time, and will make the sky appear overcast. Also seems, that most people, pay about as much attention to the sky, as they do to what our government is doing...