0000001609 00000 n Bangladesh : Rainfall & Weather. Unusual rainfall and long lasting rainy season is a great factor to take account into. These account for 70% of the annual total in the eastern part, 80% in the southwest, and slightly over 85% in the northwestern part of Bangladesh. It is generally claimed that the temperature of the earth has been increasing since the beginning of the 20th century. Short duration As a result, a stream of warm and moist air from the Bay of Bengal flows toward the above-mentioned low pressure through Bangladesh (similar flow prevails from the Arabian Sea toward India). 0000004948 00000 n The mean rainfall during the monsoon season ranges from 1000 mm to 3000 mm in the country. The monsoon is less intense in the west, where the annual rainfall is around 1,500/1,600 mm (60/63 in), with a maximum in July of about 300/350 mm (12/13.5 … The dry season begins first in the west-central part of the country by mid-December, where its duration is about four months, and it advances toward east and south, reaching the eastern and southern margins of the country by mid-March where its duration is about one month. A second maximum is centered in Assam, which covers a smaller area, with higher intensity intense (250 mm/year), and better agreement among the models than the first maximum. 0000004805 00000 n Rainfall. During the winter season, a centre of high pressure lies over the northwestern part of India. 0000005555 00000 n The driest month of the season is December when the northern and the western districts get hardly 3 -10 mm of rainfall . Daily Rainfall Data 1007. Weather bulletins and forecasting by the Bangladesh Meteorological Department for 6-hour, 12-hour and 24-hour periods are broadcast on radio and television. 0000002173 00000 n Volume(N3) Issue3(Vn3) Issue4(Vn3) Issue5(Vn3) Volume(N4) … During this season, wind inside the country generally have a northerly component (flowing from north or northwest). In the present climate, annual precipitation over the domain ranges from 500 mm (Tibet) to 2500 mm (Bangladesh). The summers here have a good deal of rainfall, while the winters have very little. Go to resource. As a result of the flow of cold-dry winds from the northwestern part of India during the winter season, the cloud cover is at a minimum. Rainfall Table; Water Level Table; Forecast & Warning . 0000008496 00000 n After the withdrawal of the summer monsoon, the cloud cover decreases rapidly, dropping to 25% in the northern and western parts, and 40-50% in the southern and eastern parts. Averages are for Dhaka, which is 4 miles from Dhaka. Based on weather reports collected during 2005–2015. The average temperature in Dhaka is 25.9 °C | 78.6 °F. Thus, a better understanding of rainfall variations has important implications for the economy and society of Bangladesh. developed to estimate near real-time rainfall in Bangladesh using satellite data. %PDF-1.4 %âãÏÓ Bibliography Rafique Ahmed, Abhaoa O Jalabayu Vijnan (Meteorology and Climatology, written in Bangla), MS Alam, Department of Geography and Environmental Studies, University of Rajshahi, Bangladesh, 1997; RG Barry and RJ Chorley, Atmosphere, Weather and Climate, Routledge, London and New York, 1998. http://en.banglapedia.org/index.php?title=Climate&oldid=16046. MRI-AGCM, to simulate rainfall and mean surface air temperature. However, there is another side to the argument. [Rafique Ahmed]. So, the prevailing wind direction in Bangladesh during the summer season has generally a southerly component (flowing from the south, southwest or southeast). To its south lies the bay of bengal, and to the west lie the plainland of west bengal and the vast tract of the Gangetic Plain. 0000002756 00000 n Climate change will increase around 5% of the country's rainfall by 2030 (Su et al., 2006) and small changes in mean and standard deviation will largely impact on rainfall intensity. Climate Report; Report on Roanu; Report on MORA; Newsletter. Heavy rainfall is characteristic of Bangladesh causing it to flood every year. Environment. %%EOF In low and tropical latitudes the change would be very small (only 0.05°-0.25°C). This narrow zone of discontinuity lies between the hot dry air coming from the upper Gangetic plain and the warm moist air coming from the Bay of Bengal. 238 0 obj<> endobj The average annual rainfall varies from a maximum of 5,690 mm in the northeast of the country to minimum of 1,110 mm in the west. 0000037077 00000 n The most striking feature of its climate is the reversal of the wind circulation between summer and winter, which is an integral part of the circulation system of the South Asian subcontinent. 0000001883 00000 n Bangladesh is located in the tropical monsoon region and its climate is characterised by high temperature, heavy rainfall, often excessive humidity, and fairly marked seasonal variations. 0000013069 00000 n Clouds In Bangladesh, the cloud cover has two opposing seasonal patterns, coinciding with the winter monsoon and the summer monsoon. 0000003825 00000 n REFERENCES Bell F. C.1969. If this prediction comes true, then a significant area of the southern half of Bangladesh will be submerged by the Bay of Bengal. On an average, the cloud cover in this season is about 10% almost all over the country. Geographic distribution of annual rainfall shows a variation from 150 cm in the west-central part of the country to more than 400 cm in the northeastern and southeastern parts. As this season progresses, this discontinuity weakens and retreats toward northwest, and finally disappears by the end of the season, making room for the onset of the summer monsoon. This page was last modified on 2 December 2014, at 16:41. Annual Weather Averages Near Rajshahi. The climate is tropical in Dhaka. Northerly component ( flowing from north or northwest ) millibars during March through September techniques are already developed for region! The lowest Monthly average of 58.5 % has been increasing since the beginning of the winter season, wind during! 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