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Punalur recorded the highest temperatures in the country on January 15 to 19 and 21, 22, 24, 30, and 31.
The Met department has issued yellow alerts in Pathanamthitta, Ernakulam, Idukki, Palakkad and Kozhikode.
Met department advised fishers against venturing into the sea in the Lakshadweep area.
The maximum storage limit of the 128-year-old dam is 142 ft.
The rise in water level was the result of unexpected and continuous rains received in the catchment area from Sunday afternoon.
The shutters will be open in different phases starting from 10 am on Tuesday and will release 1,000 cusecs of water through its spillway.
A yellow alert was issued in the six districts of Alappuzha, Kottayam, Ernakulam, Idukki, Thrissur and Palakkad.
The weather agency on Saturday sounded an orange alert for Thiruvananthapuram, Kollam, Pathanamthitta, and Idukki.
A yellow alert indicates rainfall ranging from 64.5 mm to 115.5 mm within 24 hours.
Chennai and nearby Chengalpet, Kancheepuram and Tiruvallur districts among others received widespread rains since late Sunday.