Cyclones, thunderstorms, floods likely in May

This month is likely to see a huge change in the country's weather. On the one hand, there are signs of flash floods, low pressure, cyclones and strong thunderstorms; on the other hand, there may be less than normal rainfall but with severe thunderstorms.

The information was disclosed at a meeting held at the Meteorological Department to highlight the weather situation in advance for the ongoing month.

Informing about the meeting, meteorologist Sham Saju said that a meeting of the meteorological committee is held at the beginning of every month with the director of the department in the chair. The long-term weather forecast for the current month was made from this meeting. It also comes with a review of the previous month.

According to a report signed by director of the department, Samsuddin Ahmed, during the review of various weather data in April, it was observed that there was less than normal (-79 percent) rainfall across the country. There has been less rainfall than normal due to less impact of western and eastern light pressure.

The country is also likely to experience slightly less rainfall than normal this May. In connection with the western light pressure and increasing the supply of water vapor in the lower part of the atmosphere, April 4, 06, 18, 21 and 30 experienced gusts of wind and lightning, rain or thunderstorm in Sylhet, Chittagong, Dhaka, Rajshahi and Rangpur divisions. At this time the maximum wind speed rose to 63km in Dhaka on 21 April.

Due to low light pressure in West Bengal and adjoining areas on 20th and 25th April in Rajshahi, Jessore and Kushtia areas with intense heat wave on 1-04, 10-18, 19-21, 23-30 April in Khulna, Barisal, Chittagong, Sylhet, Dhaka, Rangpur, Mymensingh. Also, in many places of Rajshahi division, there was mild to moderate heat wave from between 36-40 degree Celsius. At that time, the temperature in the country rose to 41.2 degrees Celsius on April 25 in Jessore, highest of the season.

According to the forecast, one to two depressions may be formed in the Bay of Bengal in May. One of these could turn into a cyclone. In the northern and central parts of the country, moderate or severe thunderstorms and hailstorms are expected for two to three days in some parts of the country. There may be 5 to 7 days of hail with thunderstorms and light to moderate thunderstorms.

This month, there will be an intense heat wave, expected to be above 40 degrees in the western part of the country and 1-2 mild (36-38 degrees Celsius) to moderate (38-40 degrees Celsius) heat waves across the country.

On the other hand, short-term flash floods are likely to occur in the northern and northeastern parts of the country due to heavy rainfall. During this time the average daily evaporation will be 4.25 to 5.25 millimeters, and the average bright sun rays are said to be 6.5 to 7.5 hours.

According to agro-climatic conditions, the average daily evaporation in May may be between 4.2 mm and 5.25 mm and the average bright sunlight period will be between 6.5 and 7.5 hours.