Miami : Crews are preparing for a weather system that is forecast to become Tropical Storm Imelda later on Sunday AEST before approaching the coast of South Carolina as a hurricane early next week.

Meanwhile, Hurricane Humberto strengthened into a Category 5 storm in the Atlantic and threatened the Virgin Islands, Puerto Rico and Bermuda.

The preparations in the Caribbean and the US south-east came as Vietnam closed airports and evacuated thousands of people as intensifying Typhoon Bualoi barrelled towards the country, days after causing at least 10 deaths and widespread flooding in the Philippines. The typhoon, which was packing wind speeds of up to 133km/h as of noon Sunday AEST, is expected to make landfall in central Vietnam late on Sunday, earlier than previous forecasts as it was

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