At 6:00 pm (1000 GMT), Chanchu was centered about 440 kilometers (273 miles) south-southeast of Hong Kong and was moving north at 18 kilometers per hour towards the city and the eastern part of southern China's Guangdong province, the Hong Kong Observatory said.

In Hong Kong, signs that warn residents to prepare for a possible typhoon could be seen outside ferry terminals and in office buildings.

Although the air was still calm with only thin drizzle on Tuesday afternoon, officials at the Observatory predicted stronger winds and heavy rains later Tuesday or Wednesday morning, when it will consider raising its alert level.

"The intensity of the typhoon remains at 130 kilometers per hour. So it's a very intense typhoon. We expect local wind to strengthen gradually today," said Pon Hoi-to, senior scientific officer at the Observatory.

"The outer rainbands of Chanchu are now quite close to Hong Kong. So we are expecting squally heavy showers to set in later today. The weather will be worse tomorrow with heavy rain and squalls," he added.

The coastal regions between Shenzhen and Raoping County could take the brunt of the typhoon when Chanchu makes landfall, expected to be Wednesday afternoon or Thursday morning, according to the meteorological station in Guangzhou.

But it may also bypass Guangdong province and move towards Fujian province or the Taiwan Strait, said Huang Zhong, weather chief at the Guangzhou station, Xinhua news agency reported.

He said the typhoon will bring high winds off Guangdong province as well as rainstorms to most parts of the area and south of the Pearl River Delta starting Tuesday night.

Hainan province has already cancelled public transport between the island province and Guangdong by sea and by rail.

Meteorologists in the nearby Taiwan also issued an alert against downpours and strong winds there.

In Hong Kong, officials have cautioned people living in wooden huts and in low-lying areas to take precautions against strong winds and flooding.

They also advised residents to stay away from the shoreline and avoid water sports and warned those with small vessels to seek shelter as soon as possible.

Due to large waves in some areas, the lifesaving services at several beaches have also been suspended.

Chanchu hit central Philippines over the weekend where 13 people were still reported missing, triggering landslides and widespread flooding, and forcing more than 42,000 people to evacuate their homes.

Hong Kong regularly suffers torrential rain and flooding from typhoons that normally occur between May and November each year.

The most devastating in Hong Kong's recorded history was the "Great Typhoon" of September 1937, which sank thousands of junks and cargo boats and killed more than 10,000 people.

One of the worst in more recent history was Typhoon Wanda, in 1962, which claimed more than 130 lives, left dozens more missing and wrecked around 1,000 boats and ships.

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