The Pacific nation of Tonga is bracing for destructive winds and potential flash flooding from Tropical Cyclone Gita after the powerful storm pummelled Samoa over the weekend.
The Category 4 storm is moving south across the Pacific and expected to hit Tonga's capital, Nuku'alofa, by 7 pm on Monday (1700 AEDT), prompting the island nation to declare a state of emergency.
"Very destructive hurricane force winds are expected from this evening," the Tongan Metservice said in a hurricane warning.
The Metservice said it expects Cyclone Gita to peak at a Category 4 event, but other regional meteorological agencies said the storm would reach Category 5, the most destructive wind-speed ranking.
Aid agencies warned of potential damage from heavy rain and winds, which the Metservice said could reach up to to 185 km per hour.
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Schools and workplaces in Tonga, which has a population of over just over 100,000, were closed ahead of the storm.
The Red Cross said residents were racing to identify strong buildings to be used for evacuations and to clean up debris such as loose wood or metal that could turn into dangerous missiles in powerful winds.
The Metservice has also warned of huge coastal swells and flooding of low-lying areas.
Cyclone Gita pummelled Samoa and American Samoa, about 900 km to the northeast, over the weekend, flooding the Samoan capital, Apia. About 300 people had evacuated but were now returning to their homes, Butler said. Many people remained without clean, running water.
