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Isolated extreme rainfall is expected across Kerala during the next two days, followed by heavy to very heavy rainfall over the next three days, while isolated heavy to very heavy rainfall, along with extremely high rains, is expected over Meghalaya until May 17.

Since Saturday, several districts in north-east India, particularly Assam and Meghalaya, and practically all districts in Kerala have seen heavy downpours, according to the India Meteorological Department. This has caused flooding in a number of areas across both regions.

The Southwest Monsoon will move into the South Andaman Sea, Nicobar Islands, and the Southeast Bay of Bengal over the next 24 hours, according to the IMD report. "Over the next five days, widespread rainfall with isolated heavy falls and thunderstorm/lightning/gutsy winds are highly likely over the Andaman & Nicobar Islands due to strong equatorial flow from the Bay of Bengal to the Andaman Sea in lower tropospheric levels."

Strong southwesterly winds from the Bay of Bengal to the northeast and neighbouring east India at the lower tropospheric level were blamed by the IMD for heavy to extremely heavy rains in NE India.

According to the Central Water Commission (CWC) advisory for Kerala and the ghat areas of Tamil Nadu, an alert should be issued in almost all districts of Kerala for the next two days, as water levels in the Cauvery, Kuttiyadi, Bhatathapuzha, Karuvannur, Keecheri, and Periyar rivers are expected to rise. At 2 p.m., the river Manimala in Kallooppara, Pathnamthitta district, was flowing above the warning level.