The storm is expected to hit central parts of the country with winds of up to 278 km/h.
Ferry operations have been suspended and fishing boats ordered back to port, while schools have begun closing and evacuations are taking place in some areas.
There are fears that Haiyan could be as devastating as Typhoon Botha in 2012, which killed more than 1,000 people and left a damage bill of around $1 billion.
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