Map tracking Cyclone Ula Photo: Fiji Met Service
Tropical Cyclone Ula has again strengthened to a category two system over waters between Fiji and Vanuatu.
The cyclone, whose strength had peaked last weekend when it crossed northern Tonga and Fiji's Lau group, is changing direction again.
After being on a northwesterly trajectory, Cyclone Ula is forecast to turn towards the southwest.
By Monday its centre is predicted to reach the southernmost islands of Vanuatu and weaken to a category one system.
A storm warning is in force for ships within 500 kilometres of Ula.