Low pressure may form in Bay, rain and thunderstorms likely to intensify in August

One to two monsoon low-pressure systems may form over the Bay of Bengal this August, with at least one potentially developing into a depression, according to the Bangladesh Meteorological Department's long-range forecast.

The forecast also points to several spells of thunderstorms, above-normal temperatures and isolated heatwaves across the country during the month.

Overall rainfall is expected to remain around the normal range in August, while thunderstorms could occur on around five to six days during the month.

The weather office said both daytime and nighttime temperatures may remain slightly above normal. One to two spells of mild to moderate heatwaves could also affect parts of the country.

A mild heatwave is defined as temperatures between 36°C and 37.9°C, while a moderate heatwave refers to temperatures ranging from 38°C to 39.9°C.

Meanwhile, continued rainfall could cause water levels in the country's major rivers to rise. Short-lived flooding is also possible in parts of the northern, northeastern and southeastern regions, particularly following periods of heavy monsoon rain.

The long-range outlook estimates average daily evaporation at 2.5 to 4.5 millimetres, while the country could receive around 2.5 to 4.5 hours of bright sunshine on average each day.

Overall, August is likely to bring a mix of rain, thunderstorms and periods of intense heat. The formation of low-pressure systems over the Bay of Bengal could also trigger temporary shifts in weather conditions and increase rainfall in some areas.