In a telephonic conversation on Friday, Singh had assured Vijayan all central help to the state government to deal with the rains and floods.
Vijayan made the announcement while presiding over a review meeting called held in Wayanad (Kerala) to discuss the loss and destruction caused due to the heavy rains over the past four days.
The floods in Kerala have killed at least 29 and left thousands of people homeless.
The home minister will undertake a survey of the flood-affected areas in Kerala on Sunday, a Home Ministry spokesperson said.
Though there was a respite from rains across the state today, especially in catchment areas of Idukki dam, the Indian Meteorological Department issued a "Red alert" asking people to be cautious as there was a possibility of heavy to very heavy rain in most places in Idukki, Wayanad, Kannur, Ernakulam, Palakkad and Malappuram.
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Scores of people residing in Cheruthoni town were evacuated from their homes. The deaths were reported from Idukki, Malappuram, Kozhikode, Ernakulam and Thiruvananthapuram districts since the rains came down heavily since Wednesday.
"Our rescue team are taking all the necessary measures in order to combat with the current situation". As many as 60,622 persons have been accommodated in 513 relief camps. "However, the forecast about heavy rain in the coming days should be taken seriously", he said.
The full reservoir level is 2,403 feet and storage capacity is 69,268 Mcft and storage percentage is 97.61 per cent.
Idukki has received 129.80 mm rainfall.With water levels rising in various dams and reaching nearly maximum capacity, shutters of at least 22 reservoirs in the state have been opened to drain out excess water.
After an aerial survey of the flood-ravaged districts and visiting some of the relief camps, Chief Minister Pinarayi Vijayan announced an ex gratia of Rs. 4 lakh to the next of kin of those who had lost their lives in rain-related incidents, Rs. 4 lakh to those who have lost their homes and Rs. 10 lakh to those who have lost both their homes and land. "We stand shoulder to shoulder with the people of Kerala in the wake of this calamity", the PM said in a tweet.