At first I thought these were unusual cloud formations I hadn't noticed before, but then I realized they were not clouds at all. They are long streaks of smoke(?) trailing behind planes that spend hours flying back and forth across the skies in my neck of the woods.
Back in the day when I was young, there were planes called skywriters that used to do that too, but they would write stuff in the sky--not just create thin white lines that start looking like clouds as they start to disperse.
Do any of you know what the purpose of these planes might be today? It must be pretty boring doing nothing but draw line after line all day every day. But then who am I to say?