A tropical cyclone alert remains in force for Niue as Cyclone Tam is hitting Tonga.
A strong wind warning remains in force for Tuvalu and Walis and Futuna.
At midday, the storm's centre was about 200 kilometres from Vava'u in northern Tonga as the system keeps moving in a southeasterly direction.
The Tongan islands of Niuafo'ou and Niuatoputapu, as well as the Ha'apai and the Vava'u group can expect damaging gale force winds.
