The balloon rises with the sun.
When we went out for our walk on Friday morning, I heard the familiar "whoosh" of a balloon's propane burner. Sure enough, a balloon was climbing up in the southern sky. It was moving very slowly toward us; there was very little wind that morning. Callie started barking and running around the vineyard, up and down the rows, trying the chase the balloon away. I could hear other dogs in the distance, under the balloon, doing likewise.
The balloon is an advertisement for a well-known brand.
Eventually the balloon crossed our path and moved very slowly on toward the north before disappearing from view behind some trees. It was only then that Callie calmed down. She had once again saved us from a horrible end by chasing away that big, menacing ball in the sky.