"Heavy to very heavy rains at a few places with extremely heavy rains at one or two places in south Odisha districts and heavy to very heavy rains at one or two places in north districts is likely during 24 hours", said a weather bulletin.
The IAF choppers are being used in Kalyansinghpur block, where people are trapped on rooftops of submerged houses.
Rayagada district collector is in charge of the situation.
Stating that the state control room in the SRC office is tracking the situation, Patnaik said the ODRAF, fire service and CRPF were on the spot for undertaking rescue and relief.
Road communication between Rayagada and Bhawanipatna has been disrupted as flood water is now flowing on the major road in the area which is now completely cut-off.
Several roads and bridges have been damaged in the floods.
Floodwater entered block headquarter town of Kalayansinghpur in Rayagada district forcing many inhabitants to take shelter in the first floor and roof.
"There are flash floods in Kalyansinghpur of Rayagada caused by the rivers Nagavalli and Kalyani", Chief Minister Naveen Patnaik said after reviewing the flood situation at an emergency meeting held at the office of the Special Relief Commissioner (SRC). A person died in landslide in Chullibadi village in Kalahandi district. In fact, reports of floodwater entering four other residential schools for tribals in Kalyansinghpur block were received by Rayagada district administration.
An East Coast Railway (ECoR) official said train services have been severely affected along the Rayagada-Titlagarh railway section as a bridge between Theruvali and Singapur Road Railway stations was washed away. According to the MeT department, the heavy pouring is caused due to a low pressure over the Bay of Bengal.
Several bridges, including a railway overbridge, were washed away in the floods caused by incessant rains in the two districts.