Well, in the story, Leah Clearwater and Jacob Black's howling has deep significance. Their howls are not just simple noises. They are expressions of their connection to their wolf forms and to the pack. Jacob, being a central figure, and Leah, with her own complex character in the werewolf world, use howling as a means to assert their presence. It can also be a way to show their emotions. When they are excited or on the hunt, the howls are more intense and carry a sense of purpose.
Leah Clearwater and Jacob Black's howling is often related to their werewolf nature in the Twilight series. When they howl, it can be a form of communication within their pack. It's a way to convey messages, like warnings or calls to gather. For example, when there's a threat approaching, their howls can alert other pack members.