Deputy director of the centre Pradeep Kodippili requests residents of low lying areas close these rivers to evacuate to safe locations.
Land slide warning too, in force
He also says the 24-hour land slide warning issued by the National Building Research Organization at 10.00 am is still in force.
The target areas are Eheliyagoda and Weligepola in Ratnapura, Nuwara Eliya, Yakkalamulla and Nagoda in Galle, Elkaduwa in Matale, Passara and Welimada in Badulla, Welawaya in Moneragala, and Palindanuwara, Bulathsinhala, Ingiriya and Agalawatte in Kalutara.
Relevant agencies are on alert to face any contingency situation, said Kodippili, adding that the telephone numbers 117, 2670002 and 2136136 remain open to inform about same.
Meanwhile, the Met Department says the cyclone Ockhi is moving away from the island and presently lies at Arabian Sea 600 km west of Colombo.
However, rains of around 100 mm are expected in northern, northcentral, Uva, central, southern, western and Sabaragamuwa provinces, with the last three provinces likely to experience strong winds of up to 50 kmph as well.
The Dept. requests the public to be cautious of lightning hazards.