Kerala’s government said 80 of the state’s dams had reached precarious levels and it appealed to residents to heed evacuation warnings. At least eight people were killed when an irrigation dam burst, starting a landslide that hit three houses.

Prime Minister Narendra Modi said on Friday he would tour Kerala to take stock of the devastation.

Since last week, the central government has deployed the Army, Air Force, Coast Guard and Navy to the state and sent an additional 540 troops on Thursday. Another 200 boats and 23 helicopters were expected to arrive on Friday, state officials said.

The annual monsoon brings strong winds and heavy rains every summer to India. But the season this year has been particularly severe in Kerala, which has witnessed excess rainfall of some 37 percent compared with last year, officials said.