Bay of Bengal: Deep Depression One tracking northward over Bay of Bengal late May 25

Deep Depression One is tracking northward over the northern part of the Bay of Bengal late May 25. As of 18:00 BST, the storm's center of circulation was approximately 435 km (270 miles) south-southeast of Kolkata, India.

Forecast models indicate that the system will strengthen into a cyclonic storm and become named storm Remal as it tracks north-northeastward toward the coast of Bangladesh late May 25-May 26 before making landfall over Khulna Division early evening May 26. The storm will weaken into a depression as it tracks north-northeastward over western Khulna Division and southern and central Dhaka Division May 27. The storm's track and intensity forecast remains somewhat uncertain, and changes may occur over the coming hours and days.

As of May 25, the Bangladesh Meteorological Department had advised the maritime ports of Mongla and Payra to hoist Danger Signal No. 7 (level 7 on a 10-tier scale) and Chattogram and Cox's Bazaar to hoist Danger Signal No. 6 due to the system's approach. Rainfall totals of 4.4-8.8 cm (1.7-3.5 inches) and localized higher amounts are forecast over much of Bangladesh during the passing of the storm, and storm surge of around 0.9-1.5 meters (3-5 feet) is forecast in coastal areas. Authorities have advised all vessels in the North Bay and the deep sea to remain in port until further notice. The Bangladesh Inland Water Transport Authority (BIWTA) suspended river transport operations in coastal areas from late May 25.

The India Meteorological Department (IMD) has warned of heavy rainfall and strong winds over parts of West Bengal, Odisha, Nagaland, Manipur, Mizoram, Tripura, Assam, Meghalaya, and Arunachal Pradesh states over the coming days, as well as storm surge of up to around 1 meter (3 feet) in coastal areas of West Bengal around the time the storm makes landfall. The IMD has issued red heavy rainfall and strong wind warnings (the highest level on a three-tier scale) over Gangetic West Bengal State May 26 and red heavy rainfall, thunderstorm, and lightning warnings over Nagaland, Manipur, Mizoram, and Tripura states May 27. Orange heavy rainfall, thunderstorm, and lightning warnings are in place over Nagaland, Manipur, Mizoram, and Tripura states May 26 and over Arunachal Pradesh, Assam, Meghalaya, Sikkim, and West Bengal May 27. Yellow thunderstorm and lightning warnings are in place over much of the rest of eastern and northeastern India May 25-27, with yellow strong wind warnings in place over Odisha and Gangetic West Bengal May 25 and Odisha May 26. Officials will likely issue new alerts or update/rescind existing advisories as the storm progresses.

Authorities in Bangladesh have advised officials in Satkhira, Bagerhat, Khulna, Barguna, Patuakhali, and Bhola districts of coastal Barisal and Khulna divisions to take special precautions ahead of the arrival of the storm; some 4,000 storm shelters have been established in these areas. Authorities in India's West Bengal State plan to evacuate around 8,000-10,000 people from low-lying at-risk coastal areas of the state. Airport officials at Netaji Subhash Chandra Bose International Airport (CCU) in Kolkata have announced that flight operations will be suspended at the airport from 12:00 IST May 26 through 09:00 May 27. Flight disruptions at other airports in the region and temporary closures of ports are also possible.

Sustained heavy rainfall could trigger flooding in low-lying areas and those with easily overwhelmed drainage systems. Flash flooding, landslides, and additional evacuations are possible if weather conditions prove hazardous.

The inclement weather could trigger localized business, transport, and utility disruptions, rendering some bridges or roadways impassable. Stagnant pools of water during and after flooding may increase the incidence of insect- and waterborne diseases, such as dengue fever, cholera, and malaria. Any raw sewage and other hazardous materials mixed with floodwaters would pose a serious health threat.