Hundreds have died across India in torrential rain, floods and landslides since the onset of the wet season in April.
Nepal has begun rescue and relief operations after landslides and floods triggered by monsoon rain across the country claimed at least 49 lives, the government said.
The Nepal Red Cross Society is also working with local authorities to warn thousands of people of further threats from rising rivers and further landslides.
The meteorological department forecast that central and western plains were likely to receive heavy rainfall from this evening.
At least 36 persons have been reported missing in the low-lying areas, over 20 injured and thousands of families have been displaced since Friday, Xinhua news agency reported.
Almost 8300 police and army personnel have been deployed to carry out rescue and relief operations. Officials said they would be fixing the electricity lines soon.
Heavy rains have lashed Nepal for the last three days causing flooding and landslides.
"There isn't a house without water", said Raghu Ram Mehta, a resident of the southern district of Sunsari which has suffered nine deaths, the highest of any district.
Following the rescue operation, over 200 people from Narainapur, Holiya, Phattepur, Tikulipur, Bairiya Sikta among other places of Banke district were rescued to safer zones.
"Hundreds of families are taking shelter in local schools".
Biratnagar airport in the eastern district of Morang was closed after being submerged in a metre of water, authorities at the worldwide terminal said.
Prime Minister Sher Bahadur Deuba has instructed administrators in flood-hit districts to expedite rescue and relief efforts.
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