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Packing heavy winds and rain, the storm heaped more misery on the after Sunday's disaster turned small communities into wastelands of mud and uprooted trees and forced thousands of people into shelters.

Downpours are expected over the next day as the storm triggers offshore waves as high as six metres (20 feet), Indonesia's disaster agency said.

The cyclone, which was picking up strength as it moved toward the west coast of Australia, hampered efforts to reach trapped survivors.

Indonesia's disaster agency said at least 70 people have been killed, with another 70 missing. 

Many of the deaths were in Timor's inundated capital Dili, where the front of the presidential palace was transformed into a mud pit.In East Timor, at least 21 people have been killed according to an official in the tiny half-island nation of 1.3 million that lies between Indonesia and Australia.

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In Indonesia's remote East Flores municipality, torrents of mud washed over homes, bridges and roads, while strong waves have prevented search teams from accessing the hardest-hit areas.

On Lembata, an island east of Flores, parts of some villages were swept down a mountainside and carried to the shore of the ocean.

Soon after flash floods began tearing into resident Basir Langoday's district in the early morning, he heard screams for help from a nearby home covered in rubble. 

"There were four of them inside. Three survived but the other one didn't make it," he told reporters. 

Langoday and his friends scrambled to try and save the trapped man before he was crushed to death. 

"He said 'hurry, I can't hold on any longer," Langoday added. 

Juna Witak, another Lembata resident, joined his family at a local hospital where they wept over the corpse of his mother who was killed in a flash flood Sunday. Her body was found by the seashore.

"There was a rumbling sound and the floods swept away homes, everything," Witak said.

'Medicine, food, blankets'

Indonesian President Joko Widodo expressed "deepest condolences" over the devastation in the southeast end of the archipelago.

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"I understand the deep sorrow suffered by our brothers and sisters because of this disaster," he said in a nationwide address.

Across the region, residents have flocked to temporary shelters or taken refuge in what was left of their homes.

"The evacuees are spread out. There are hundreds in each sub-district but many others are staying at home," said Alfons Hada Bethan, head of the East Flores disaster agency.

"They need medicine, food, blankets."

Some 2,500 people had been evacuated in East Timor, with several thousand more in Indonesia.

Pounding rains challenged efforts to find any survivors.

"We suspect many people are buried but it's not clear how many are missing," Bethan said.

In Lembata, local officials were forced to deploy heavy equipment to reopen the roads.  

Images from the island showed barefoot locals wading through mud and past collapsed houses to evacuate victims on makeshift stretchers.

Fatal landslides and flash floods are common across the Indonesian archipelago during the rainy season. 

January saw flash floods hit the Indonesian town of Sumedang in West Java, killing 40 people.  

And last September, at least 11 people were killed in landslides on Borneo. 

The disaster agency has estimated that 125 million Indonesians - nearly half of the country's population - live in areas at risk of landslides.

The disasters are often caused by deforestation, according to environmentalists.

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