The small islands of Kabara, Namuka, Fulaga, Ogea, Vatoa and Ono-i-Lau are warned to expect destructive storm force winds of up to 155 kilometres an hour.
The category three system, which at its centres has average winds of 150 kilometres an hour and gusts of more than 200 kilometres an hour, is tracking southwest between the islands of Kabara and Ono-i-Lau.