Landslides triggered by one of the strongest storms in decades have killed at least 15 people in southern Philippines, as parts of East Asia brace themselves for the looming storm.

Typhoon Bavi, which spans 1,000km (620 miles) at its widest point – roughly the width of France – is sweeping across the Pacific towards Taiwan.

It is expected to dump rain on Taiwan’s north and east, and on a chain of remote Japanese islands, before making landfall in south-eastern China on Saturday.

Dozens of flights have been cancelled while schools have suspended classes across the region. Supermarket shelves have been wiped clean as residents stock up on supplies ahead of the typhoon.

On the Philippine island of Mindanao, families have been buried overnight by landslides, and rescuers are still searching for those missing.

Moderate to heavy rains will continue to drench parts of the country throughout the weekend, officials say.

Taiwanese authorities have warned that Bavi could bring up to 1m (39 inches) of rainfall. Some 29,000 soldiers have been put on standby to help with relief efforts, according to the island’s defence ministry.

Bavi is set to be the largest storm, by size, to hit the island since 1987, Taiwan’s Central Weather Administration told Reuters.

Farmers across the region rushed to harvest or protect their crops while the weather held earlier on Friday, while fishermen made sure to secure their vessels tightly.

“Don’t be fooled by the nice and calm weather now. A storm like this could be the most terrifying,” 60-year-old fisherman Chen Ming-hui told Reuters.

Thousands of sandbags have been distributed to residents and shop-owners in flood-prone areas.

Across the strait, China has also warned of “significant impact” from the typhoon that could move northward after smashing into the south-eastern Fujian province.

“Bavi’s large size and abundant energy mean its remnants and outer rainbands could move from Jiangsu and Anhui provinces toward the Bohai Sea region,” said Ma Jun, director of China’s Institute of Public and Environmental Affairs.

The northern provinces, which have “less experience” dealing with typhoons in comparison with the south, should “strengthen preparations”, he warned.

Some forecasts suggest Bavi could make landfall twice in China.