Carter's ex-wife Abby (Olivia D'Abo) shows up in Eureka on the eve of Zoe's (Jordan Hinson) sixteenth birthday. Still reeling from her unexpected arrival, Carter (Colin Ferguson) is informed of an incident at the Global Dynamics Spa. He sends Jo (Erica Cerra) to investigate while he and Abby catch up. Eureka's a small town and pretty soon everyone knows that Carter's ex is in the area. Strange changes in the weather, like rain falling in just one spot and a freak snowfall, are precursors to a dust devil that blows through town. As the weather pattern worsens and hurricane conditions form in Eureka, everyone must give their all in what becomes a perilous exercise in applied physics.