BBC., 18 October 2010 Last updated at 02:59 GMT
Alex Deakin with details of the forecast track of Typhoon Megi.
Thousands of people in the Philippines have fled their homes as Super-Typhoon Megi has begun to lash the north with heavy rains and strong winds.
Emergency services are on high alert and schools have been closed in many areas as Megi bring winds of up to more than 280km/h (175mph).
It is the strongest storm the Philippines has faced in four years.
In 2006, a storm with winds of 155km/h triggered mudslides, burying villages and killing about 1,000 people.
'Zero casualties'
The northern provinces of Cagayan and Isabela are on the highest storm alert.
Officials have warned that the heavy rain and high winds could damage buildings, power supplies and agriculture.
Emergency services have been stocking up on food and medicines, says the BBC's Kate McGeown in the capital, Manila.
Government forecasters say waves off the east coast could be greater than 14m (46ft).
Analysis
Kate McGeown BBC News, Manila
Disaster management teams are on high alert - stockpiling food and medicines, and preparing boats and helicopters to rescue affected by the typhoon.
The authorities are under huge pressure to get their rescue effort right this time.
There was a lot of criticism over their handling of Typhoon Ketsana last year.
Many people who were trapped in the floodwaters said they were completely reliant on aid agencies or church organisations rather than the government.
There was further embarrassment in July this year when the weather bureau forecast that a typhoon would miss Manila.
It struck the capital, killing about 100 people. The head of the state weather bureau was sacked as a result.
Sea travel has been banned. The coast guard has been instructed to forbid all fishing vessels from setting out to sea in the north, says the AFP news agency.
Thousands of soldiers and officers are on standby to deliver aid and rescue people stranded by the floods.
Trucks, rescue boats and food packs have been pre-positioned near vulnerable areas, said Benito Ramos, a senior disaster-response official.
"This is like preparing for war," he told the Associated Press. "We know the past lessons and we're aiming for zero casualties."
Schools in the north will be closed on Monday.
Farmers were being urged to harvest as many of their crops as possible before the typhoon hit, our correspondent says.
The area in the storm's path is one of the country's main rice-growing regions.
In July, President Benigno Aquino sacked the head of the weather bureau after he failed to predict a typhoon which unexpectedly changed course and hit Manila, killing more than 100 people.
The Joint Typhoon Warning Center of the US Navy says Megi is expected to weaken to typhoon intensity as it crosses the Cordillera mountain range.
However, it will then re-emerge into the South China Sea and re-intensify as it heads for southern China.
