What did Edward mean when he said the wolves were howling out?

In the context of the Twilight series by Stephanie Meyer, when Edward says the wolves are howling out, he is referring to the Quileute werewolves who are communicating with each other through their wolf howls. The howling out is a way for the werewolves to express their emotions, communicate danger, or gather their pack. When Edward talks about the wolves howling out, it usually indicates that the werewolves are communicating in their wolf form and sharing important information between them.