Analyzing Foreshadowing in Literature

In literature, foreshadowing is subtly woven into the narrative, hinting at future events that may occur later in the story. Consider the following excerpt:

As Mark stared out at the darkening horizon, he couldn't shake the feeling that something was amiss. The distant rumble of thunder echoed ominously, and the old willow tree in his yard swayed as if warning him of impending change.

Which literary device is primarily used in this excerpt to suggest a future event?