Dhaka, April 27 -- Heavy to very heavy rainfall could trigger flash floods in the low-lying areas of Sylhet, Habiganj, and Moulvibazar districts starting Thursday, the Flood Forecasting and Warning Centre (FFWC) has warned.

The state-run agency issued a three-day alert on Monday, attributing the potential inundation to upstream runoff and intensifying seasonal rains.

"We have issued a warning for the next three days," Mostafa Kamal Jihan, assistant engineer at the FFWC, told bdnews24.com.

"This is primarily a runoff-related flood. The situation is expected to improve once the rainfall subsides."

According to the FFWC's bulletin, the Haor basin in the northeast and its upstream regions recorded moderate to heavy rainfall in the 24 hour...