Environment. More than 70% of Bangladesh's annual rainfall occurs in the monsoon (June- September) season. 0000002173 00000 n During the early part of this season, the winds are neither strong nor persistent. Climatic stations are scattered around the country - to record the diverse geographic conditions of the country. The overall objective of this paper is to assess the present trend of high intensity rainfall and compare it with the predicted future trend and gather information on the effect of climate change on rainfall pattern and intensity. The lowest average relative humidity (57%) has been recorded in Dinajpur in the month of March. Unusual rainfall and long lasting rainy season is a great factor to take account into. Average precipitation (rainfall, snow) in millimeter per month in Dhaka, Bangladesh displayed in a beautiful overview. Here the lowest monthly average of 58.5% has been recorded at Brahmanbaria in March. In this paper, differences in rain intensity in and around Bangladesh during various rainy periods are described. The rainfall in Bangladesh varies, depending upon season and location. The amount of rainfall in this season varies from about 20 cm in the west central part to slightly over 80 cm in the northeast. Rainfall Distribution Map; Inundation Map. In a year, the rainfall … Rainfall The single most dominant element of the climate of Bangladesh is the rainfall. During the early part of the pre-monsoon season, a narrow zone of air mass discontinuity lies across the country that extends from the southwestern part to the northeastern part. 0000009777 00000 n 0000066386 00000 n The department is responsible for observation, recording, operation and maintenance of weather stations and weather instruments, and for reporting of daily/weekly weather information to the public. 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. 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. 0000025793 00000 n 0000002459 00000 n Actually climatic changes on a global scale do not occur overnight; in fact, they occur only over a time scale of thousands of years. 0000037077 00000 n Atmospheric pressure and winds These are characterised by seasonal reversals between summer and winter in Bangladesh. This phenomenon, called global warming, is attributed to the increase in atmospheric carbon dioxide (CO2) due to the burning of fossil fuel. In the present climate, annual precipitation over the domain ranges from 500 mm (Tibet) to 2500 mm (Bangladesh). During the summer monsoon season, which is also the rainy season, the cloud cover is very widespread. Murshed, A.K.M. A stream of cold air flows eastward from this high pressure and enters the country through its northeast corner by changing its course clockwise, almost right-angle. Find the best time to go to Dhaka. With the progression of the season, the cloud cover increases, reaching 50-60% by the end of the pre-monsoon hot season. Bangladesh Today; Bangladesh 24hr Forecast; Bangladesh 48hr Forecast; Bangladesh 72hr Forecast; Bangladesh 96hr Forecast; Bangladesh … Go to resource. ... the number of wet days (as defined above) during the season. Humidity March and April are the least humid months over most of the western part of the country. Rainfall Table; Water Level Table; Forecast & Warning . As the winter season progresses into the pre-monsoon hot season, rainfall increases due to intense surface heat and the influx of moisture from the Bay of Bengal. The additional uplifting (by the Meghalaya Plateau) of the moist air causes higher amount of rainfall in the northeast. 0000008496 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. In late December and early January, minimum temperature in the extreme northwestern and northeastern parts of the country reaches within 4 to 7 degrees of freezing point. The winter season is very dry, and accounts for only 2%-4% of the total annual rainfall. The summers here have a good deal of rainfall, while the winters have very little. Clouds In Bangladesh, the cloud cover has two opposing seasonal patterns, coinciding with the winter monsoon and the summer monsoon. 0000001609 00000 n Average temperatures in April vary from about 27°C in the northeast to 30°C in the extreme west central part of the country. Dry Period Bulletin; Extended Range (1-15 Days) Flow Forecast (Experimental ) Special Outlook; Map. Normal Monthly Rainfall; Normal Monthly Rainy Day; Daily Normal Rainfall; Daily Normal Maximum Temperature; Daily Normal Minimum Temperature; Temperature Data; Extreme Rainfall; Publications. However, the cold winter air that moves into the country from the northwestern part of India loses much of its intensity by the time it reaches the northwestern corner of the country. %PDF-1.4 %âãÏÓ Now a day, erratic rainfall becomes very common in Bangladesh. Design/methodology/approach – The model generated rainfall was calibrated with ground-based observed data in Bangladesh … Daily Rainfall Data . 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. Dataset Info These fields are compatible with DCAT, an RDF vocabulary designed to facilitate interoperability between data catalogs published … 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 … This page was last modified on 2 December 2014, at 16:41. Averages are for Rajshahi, which is 6 miles from Rajshahi. Few techniques are already developed for specific region and climate condition of the world with different time and space domain. The average annual discharge from … developed to estimate near real-time rainfall in Bangladesh using satellite data. In that case, all low coastal plains and delta areas around the world will be submerged - thereby reducing the area of fertile agricultural lands and food production, and increasing food shortage, hunger, poverty and human misery on a global scale. This page includes a chart with historical data for Bangladesh … 0000003825 00000 n Based on weather reports collected during 2005–2015. Climate Report; Report on Roanu; Report on MORA; Newsletter. Climate the average condition of the atmosphere near the earth's surface over a long period of time, taking into account temperature, precipitation, humidity, wind, cloud, barometric pressure, etc. Annual Weather Averages Near Dhaka. The average relative humidity for the whole year ranges from 78.1% at Cox's Bazar to 70.5% at Pabna. The Köppen-Geiger climate classification is Aw. Rainfall in this season is caused by the tropical Depressions that enter the country from the Bay of Bengal. 0000036617 00000 n Climatic change Any climatic change in Bangladesh will, of course, be a part of worldwide climatic changes. At present, the rain-gauges over Bangladesh are the only tool by which to measure rainfall, so Bangladesh receives rain and cloud when some powerful western disturbance approaches from Mediterranean Sea crossing Iran , Pakistan , Northern India and then in Bangladesh . This is the only source of winter in Bangladesh . Rainfall prediction is very important for the Bangladesh economy and day to day life. However, it is more extensive in the southern and eastern parts (90%) than in the northwestern part (75%). 0000063253 00000 n Daily Rainfall Data 1007. 0000001693 00000 n <<2981f3b99c3d9341b96d8b973ad39fe6>]>> Observation and interpretation of satellite and radar imageries are important for prediction of severe weather and cyclones. According to some analysts, the effects of increased temperature will have both destructive and beneficial consequences - destructive to some areas and beneficial to other areas. 0000003527 00000 n Only few researches have been carried out so far on rainfall characteristics of Dhaka and Bangladesh. Short duration In July, rainfall amounts to 800 mm (31.5 in) in Sylhet, to 750 mm (29.5 in) in Chittagong, to 900 mm (35.5 in) in Cox's Bazar, and to as high as 1,000 mm (40 in) in Teknaf. 0000003789 00000 n Average rainy days during the season vary from 60 in the west-central part to 95 days in the southeastern and over 100 days in the northeastern part. ËD$NÈWi. Data on Daily and Monthly aggregate of rainfall of the whole of Bangladesh. The mean pressure is 1,020 millibars in January and 1,005 millibars during March through September. Because of the country's location in the tropical monsoon region, the amount of rainfall is very high. January, the same as December, is a moderately hot winter month in Dhaka, Bangladesh, with average temperature fluctuating between 12.7°C (54.9°F) and 25.4°C (77.7°F).January is the coldest month, with an average high-temperature of 25.4°C (77.7°F) and an average low-temperature of 12.7°C (54.9°F). curves, which give a plot of rainfall intensity versus rainfall duration and recurrence interval. xÚb```f``9ÂÀÁÀ dÌ È l@ÈÂÀ¡ÂÌÁÆ´¡ôÈ:eâë~êXÄÀP¸]2+m&6Àqá`ª¿ÈÆ The relative humidity is everywhere over 80% during June through September. Rainfall during the rainy season is caused by the tropical depressions that enter the country from the Bay of Bengal. In addition to radio and television, daily newspapers publish weather reports regularly on the basis of information supplied by the meteorological department. 0000002756 00000 n 240 0 obj<>stream The maximum amount of rainfall has been recorded in the northern part of Sylhet district and in the southeastern part of the country (Cox's Bazar and Bandarban districts). On the other hand, temperature increase would be much higher in the middle and high latitude regions (5°-9°C). Bangladesh has a tropical monsoon climate with significant variations in rainfall and temperature throughout the country. 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. 0000004805 00000 n 0000014915 00000 n startxref The driest month of the season is December when the northern and the western districts get hardly 3 -10 mm of rainfall . As a consequence, it is estimated that the sea level will rise 2-3 metres by the year 2050. If this prediction comes true, then a significant area of the southern half of Bangladesh will be submerged by the Bay of Bengal. Bangladesh occupies an area of 1, 47,570 square Kilometers, has a sub-tropical monsoon climate characterized by wide seasonal variations in rainfall, moderately warm … There are four main seasons: the pre-monsoon (March-May), which has the highest temperatures and experiences the maximum intensity of cyclonic 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. Through calibration and validation the MRI-AGCM was adapted for Bangladesh for generating rainfall and temperature scenarios. %%EOF Annual Weather Averages Near Rajshahi. CLIMATE OF BANGLADESH . Precipitation in Bangladesh averaged 202.39 mm from 1901 until 2015, reaching an all time high of 1005.33 mm in September of 1934 and a record low of 0.01 mm in December of 1993. The average annual rainfall at Bangladesh varies from a maximum of 5,690 mm in the northeast of the country to minimum of 1,110 mm in the west. 0000014182 00000 n After April, temperature decreases slightly during the summer months, which coincides with the rainy season. 0000004192 00000 n Rainfall at station above 50 millimeters are shown in red.red. 0000001883 00000 n The groundwater, however, provides adequate storage to compensate for annual variations in rainfall and stream flow. Observed concentration of CO2 in the atmosphere at the Muana Loa Observatory in Hawaii shows an increasing trend, from 315 ppmV in 1958 to 352 ppmV in 1988. 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