Indian Prime Minister Narendra Modi is in the southern state of Kerala to see for himself the devastation caused by what officials say is the worst flooding in a century.
He arrived late on Friday and is due to be flown over the worst-hit areas.
At least 324 people have been killed and more than 200,000 are homeless after weeks of rain triggered landslides and floods.
Troops backed by military helicopters are involved in a huge rescue effort.
More rain is forecast and a red alert in place. Strong winds are also predicted for Saturday and Sunday.
Across India close to 1,000 people have been killed in the current rainy season, which began in June, officials say.
“We are deploying more boats and the army to ramp up rescue operations,” state government official PH Kurian told AFP news agency.
Helicopters have airlifted emergency supplies to many areas and special trains that carry drinking water have been sent to the state.
Kerala’s chief minister, Pinarayi Vijayan, says the flooding as the worst the state has seen in 100 years.
He told reporters that more than 223,000 people were now living in more than 1,500 emergency relief camps set up in the area.
Parts of Kerala’s commercial capital, Cochin, are under water, snarling up roads and leaving railways across the state impassable.
Some local plantations are reported to have been inundated, endangering the local rubber, tea, coffee and spice industries.
Schools in all 14 districts of Kerala have been closed and some districts have banned tourists, citing safety concerns. -BBC
