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The NISSAP is a tool aligned with the Guidelines for Invasive Species Management in the Pacific that identifies the strategy and key actions to effectively prevent, manage and reduce the impacts of invasive species to the environment, our economy, culture and health and well-being in Tonga.

This report presents a detailed analysis of the probability for and the recurrence of tropical cyclones of varying intensity that may impact Western Samoa. The recurrence of gale to major hurricane force winds is estimated for the five degree square of ocean that includes Western Samoa as well the wind speeds that can be expected to reach Western Samoa. The deep-water significant wave height that will result from those winds is estimated, and the recurrence interval for those wave heights predicted. This information is developed for coastal engineering works in the selection of the design maximum wind speed associated with tropical cyclones, and in the selection of design waves for coastal and harbour facilities in Western Samoa.