Online Desk : Although some parts of Bangladesh experienced light to moderate rainfall, the Met Office has forecast heavy rainfall with thundershowers between May 6 and 11 across the country.

"Analyzing mathematical model of rainfall index, Bangladesh is likely to witness heavy to very heavy rainfall with thunderstorm from May 6 . . . after the prolonged heatwave, the most welcoming rainfall is expected to bring some respite from intense heat that battered the entire country since April 1," BMD meteorologist Dr Abul Kalam Mallik told BSS on Saturday.

Northeastern, central parts including Sylhet division and some parts of Mymensingh and Dhaka division are likely to experience heavy to very heavy rainfall between May 6 and 11 simultaneously south-western and north-western regions will witness rainfall with thunderstorms, he added.

Mallik warned people of staying outdoors during the hailstorm as intensity of hailstorms is increasing accompanied with frequent lightning impacted by climate change, which are largely responsible for casualties.

The meteorologist attributed uncomfortable feelings of unbearable hot-weather to high humidity persisting in the air during the afternoon and evening period suggesting avoiding movement between 12 noon to 4pm as the sunlight is getting too hot as it (the Sun) provides sunlight vertically with intense heat.

"Normally we record temperature from the air," Mallik said the highest temperature was found between 12 noon and 4pm because of vertical position of the Sun.

Analyzing humidity indexes, Mallik continued, "There is a close relation of temperature and humidity . . . discomfort feelings will increase, if high humidity persists in the air with high temperature. "Although temperature decreases after 4pm, but we feel very hot weather due to high humidity," he added.

The Met Office on Saturday recorded 39.5 degree Celsius at Rajshahi while the temperature in Dhaka was recorded at 36.9 degrees Celsius but the high humidity has exposed the residents to massive discomfort.

The BMD official said the country witnessed the longest duration of the heatwave for the past 32 days since April 1 and the met office warned the phenomenon would continue throughout the next month.

"But unlike the previous heatwaves, this year it spread all over the country," commented meteorologist Abul Kalam Mollik, who was supported by Zebunnesa as well.