Cyclone Percy is shaping up to be the fastest developing cyclone that Pacific forecasters have come across.
The cyclone has just passed by the Tokelau island group, and is now moving directly towards Swains Island, in northern American Samoa.
The New Zealand Met Office says Cyclone Percy has winds of up to 222 kilometers per hour at its centre, and is causing up to 15 meter high sea swells.
On its current track, Cyclone Percy is expected to pass close to the Manu'a islands tomorrow, and is the second cyclone to hit there in a week.
The director of the National Weather Service in American Samoa, Tafuna Mase Akapo, says Percy's storm force winds have developed quickly.
"Percy will continue to move south eastwards, and bring it down closer to the Manua islands on Sunday or Sunday night. We expect the winds to start increasing."
The Director of the National Weather Service in American Samoa, Tafuna Mase Akapo.