The Indian Meteorological Department in its latest bulletin at 1.30 p.m on Friday said that a low pressure that has formed in Southeast Arabian Sea and its neighbourhood, is likely to turn into a well marked depression in the next 24 hours, intensify into a cyclonic storm and move towards Oman coast thereafter.
It said sea was likely to be rough to very rough over south and central Arabian Sea and advised fishermen not to venture into these areas from Oct 6.
The weather department said another low pressure area is likely to form over south Bay of Bengal and neighbourhood around Oct 8.It is likely to become more marked and move to towards Odisha and adjoining north Andhra Pradesh coasts during the subsequent 72 hours.
Tamil Nadu, Kerala and Lakshadweep are likely to witness widespread rain or thundershowers with heavy to very heavy rains at isolated places during next 4 to 5 days. Ghat areas of Tamil Nadu and adjoining parts of Kerala are also likely to experience isolated extremely heavy falls around Oct 7.
It also said that north-east monsoon rains are likely to begin over Tamil Nadu, Puducherry, Kerala and adjoining parts of Andhra Pradesh and Karnataka around Oct 8.
The met department said heavy showers were witnessed in Kerala, Tamil Nadu and Lakshadweep, at many places over coastal Karnataka, south interior Karnataka and Andaman and Nicobar and at isolated places over Konkan and Goa, Rayalaseema and coastal Andhra Pradesh in the last 24 hours up to 8.30 am.
It said Kozhikode, Punalur, Palayankottai recorded 7 cm rains each, Chennai recorded 6 cm rain, Cuddalore, Kottayam and Nagapattinam 4 each; Vellore, Pamban, Valparai, Coonoor and Puducherry 3 cm. each on Friday.
Continuous rains in the whole of the night left many parts of Chennai flooded and the district administration in Chennai, Tiruvallur and Kancheepuram shut schools as well in southern Tirunelveli and Kanyakumari.