The category one storm is passing by the islands of Vava'u bringing destructive storm force winds, thunderstorms and high seas.
Cyclone Zazu is moving south-southeast and is expected to lie around 60 kilometres south of Neiafu, Vava'u at 3pm this afternoon
The storm is expected to strengthen into a category two system as it moves away from Tonga.
Photo Tonga Meteorological Services