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Heavy to very heavy rainfall is expected in Bangladesh's Chattogram and Barishal divisions over the next 48 hours, prompting warnings of waterlogging and potential landslides in hilly regions. The Bangladesh Meteorological Department (BMD) forecasts varying rainfall intensities nationwide until July 11, with a notable increase anticipated in Rangpur, Sylhet, and Mymensingh divisions after one day.

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During this period, heavy (44 to 88 mm in 24 hours) to very heavy (more than 89 mm in 24 hours) rainfall is expected in the Chattogram, Khulna, Barishal, Sylhet, Rangpur, and Mymensingh divisions.

Meteorologists attribute the current downpours to the fully active southwest monsoon, driven by a steep pressure gradient over the sea. While rainfall is expected to recede after July 12, followed by a brief respite, another spell of rain may occur at the month's end. July typically sees higher rainfall volumes, according to BMD meteorologists.

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The volume of rainfall is likely to increase in Rangpur, Sylhet, and Mymensingh divisions after a day.

Concurrently, the Flood Forecasting and Warning Centre (FFWC) predicts short-term floods in low-lying riparian areas of about 14 districts over the next three days. Specific concerns include Bandarban, Cox's Bazar, Feni, Chattogram, and Khagrachhari districts, with potential inundation also possible in Lakshmipur and Noakhali. The Teesta River in the north might flow above its danger level, threatening low-lying areas in Nilphamari and Lalmonirhat districts.

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However, heavy to very heavy rainfall is anticipated in Chattogram and Barishal divisions for the next 48 hours.

In preparation for the anticipated floods and landslides, district administrations in Bandarban and Rangamati have readied emergency shelters. Bandarban has prepared 220 shelters across seven upazilas, while Rangamati has 204 shelters ready in ten upazilas. The FFWC expects river water levels to begin receding after three to four days.

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Even though the depression has moved away, the southwest monsoon remains fully active over Bangladesh due to a steep pressure gradient over the sea. This is why we are experiencing heavy rainfall for the next consecutive days.