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The landfall process of severe cyclonic storm Dana began on Thursday night and was expected to continue till Friday morning, the Indian Meteorological Department (IMD) said.
At 4.30 pm, the storm was located 150 km southeast of Paradip (Odisha) and 250 km south-southeast of West Bengal's Sagar Island.
In anticipation of the cyclone, West Bengal Chief Minister Mamata Banerjee announced that the state had identified more than 3.5 lakh people for evacuation from low-lying areas. As of Thursday, 243,374 people had already taken shelter in relief camps.
"For evacuation from low-lying areas, we have identified 356,941 people," Ms Banerjee told reporters, adding that she would remain at the state secretariat overnight to monitor the situation. Chief secretary Manoj Pant and home secretary Nandini Chakraborty are also overseeing the evacuation and relief operations.
South Bengal districts, including Kolkata, Howrah, Hooghly and the 24 Parganas, have already begun experiencing moderate to heavy rains and gusty winds, with weather conditions expected to worsen. The IMD has warned of "heavy to very heavy rainfall" in these areas, with isolated places likely to see "extremely heavy downpours" over the next 48 hours.
Fishermen have been advised to stay away from the sea as wind speeds of up to 110 kmph are anticipated over the northwest Bay of Bengal. The storm is expected to strengthen, with winds reaching 120 kmph during landfall before gradually subsiding.
Public transportation across southern Bengal could be severely impacted. South Eastern Railway (SER), which oversees routes in West Bengal, Odisha, and Jharkhand, has cancelled more than 170 express and passenger trains scheduled between October 23 and 27.
In addition, Eastern Railway cancelled 68 suburban trains in the Howrah division for Friday morning, while all EMU local trains from Sealdah station were suspended from Thursday evening through Friday morning. Kolkata Port authorities also halted ship movements until Friday evening as a precautionary measure.
Operations at Kolkata's Netaji Subhas Chandra Bose International Airport were suspended from 6 pm on Thursday until 9 am on Friday due to expected high winds and heavy rain. Airport Director Pravat Ranjan Beuria said necessary precautions have been taken, including securing planes, retracting aerobridges, and ensuring all loose equipment have been tied.
Thirteen battalions from the state's disaster management force and 14 battalions from the National Disaster Response Force (NDRF) have been deployed in the coastal regions. Meanwhile, the Indian Coast Guard has mobilised vessels and aircraft to respond to any distress situations at sea.
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