List of Scientist; List of Engineers; AWS Data; WB Project. Therefore, it is indispensable duty to us to take proper crop managements against extreme conditions of meteorological droughts to increase the crop yield. Natural Hazards 46: 391–413, The relationship of drought frequency and duration to time scales. A crop faces many biotic and abiotic stresses during their growing period. Figure 5 presented the changes and linear trends of drought areas during 1980-2015 over different seasons of Bangladesh. Engg. The calculation of Standardized Precipitation Index (SPI) [10,11] was followed in this research to assess anomalous and extreme precipitation developed the Standardized Precipitation Index (SPI) for the purpose of defining and monitoring drought [10,11]. The results revealed that the most significant increasing trend of drought area was found in Rabi season (8.66% per decade) and decreasing trend was found in Kharif season (2.47% per decade). Moreover, in Kharif season; the highest percentage of dry period was 55.56% in Comilla and Dhaka (Table 2). Meteorological drought assessment of southern and western region. IMD is headquartered in Delhi and operates hundreds of observation stations across India and Antarctica. All Rights Reserved. Meteorological drought is directly related to rainfall which prolongs existence consequence the agricultural drought . In a year, the rainfall is 2022 mm | 79.6 inch. 3. The significant drought events were found in 1992, 2008, 2012 and 2014 in Pre-Kharif, 1981, 1985, 1992, 1994, 2006 and 2012 in Kharif and 1985, 1986, 2005, 2006, 2009, 2010 and 2012 in Rabi season. It was the heaviest rainfall in Islamabad in the past 100 years. The record breaking rain fell in just 10 hours. Temperature Data; Extreme Rainfall; Publications. This has caused major disruption, displacement and loss of life, and once again highlighted the importance of national meteorological and hydrological services in protecting public safety. All drought affected areas were experienced by moderate, severe and extreme droughts in several years during the study period in three seasons. Monthly data of average rainfall over Bangladesh have been collected for a maximum period of 64 years, 1948–2011. The Bangladesh Meteorological department is acknowledged for providing observational data. Table 1: Standardized Precipitation Index (SPI) values. In this study, drought intensity was investigated for three cropping seasons of Bangladesh. Monthly precipitation data of 35 meteorological stations were taken from Bangladesh Meteorological Department for a maximum period of 36 years from 1980 to 2015. Many other researchers [13-17] have applied SPI to analyze the drought characteristics in various parts of India. Bangladesh is a more vulnerable to climate change due to its geographical condition. But the terminal drought that occurred in Kharif season (T. Aman) was also responsible for losses of crop yield due to shortage of rainfall. DataApp; On Line Data Purchase; Jobs; Result; Headquarter & Other Stations; About Us. The Monsoon season begins from June till September. BMD Service Users List; Organogram; Contact Us . Three distinct seasons can be recognized from climatic point of view: the dry winter season Rabi (November to February), the pre-monsoon hot summer season Pre-Kharif (March to May), and the rainy monsoons season Kharif (June to October) . The significant drought conditions were found in Kharif season in 1981, 1985, 1992, 1994, 2006 and 2012 and in Rabi season same condition was found in 1985, 1986, 2005, 2006, 2009, 2010 and 2012. Weather is generally fair over the Andaman sea and North Bay and a few cloud to partly cloudy elsewhere over the Bay of Bengal. 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. Rainfall : 0 mm; Wind : 5 kph . Earthquake; Tsunami; Disaster Risk Reduction; Public Education. BMD Service Users List; Organogram; Contact Us . The following is the annual monsoon rainfall for the last few years based on data from the Bangladesh Meteorological Department. Time series of annual drought percentage of area for all study station of Bangladesh (and various regions within) were calculated based on the ratio of the number of stations with SPI ≤ 1.0 to the related total number of study stations or the regions . Natural Hazards 46: 391-413, Impact of climate change on irrigation water demand of dry season Boro rice in northwest Bangladesh. Variations of drought areas were also plotted and investigated by different seasons (Pre-Kharif, Kharif and Rabi) of Bangladesh. This study provides a broad knowledge about spatial and temporal variations of meteorological droughts over different regions of Bangladesh during the period 1980-2015. However, there is a distinct seasonal pattern in the annual cycle of rainfall, which is much more pronounced than the annual cycle of temperature. Environment. Regional offices are at Chennai, Mumbai, Kolkata, Nagpur, … Earth Interact 16: 1–27, Monitoring meteorological and agricultural drought dynamics in Barind region Bangladesh using standard precipitation index and Markov chain model. The base data for this work has been collected from Bangladesh Meteorological Department. Journal of Disaster Risk Studies 8: 280, Drought risk assessment in the western part of Bangladesh. Cambridge University Press, Cambridge, England, UK. In case of Pre-Kharif season (Figure 2), the most significant increasing trend of drought area was found in central region with a rate of 7.18% per 10 years followed by southern and western region with a rate of 5.42% per 10 years and northern region with a rate of 1.31% per 10 years. 1971, it became Bangladesh Meteorological Department (BMD). In 2012, eastern regions were severely affected, and some area of central region and south-western region were moderately affected by meteorological drought. The summers here have a good deal of rainfall, while the winters have very little. I, Global environmental change 37: 309-346, Application of Palmer method in analyzing drought in Northwest region of Bangladesh, M.Sc. Meteorological drought; Rainfall data; Spatial analysis; SPI"> Heavy Rainfall Warning; Agromet. Bangladesh BMD monthly rainfall: Bangladesh Meteorological Department. On the other hand, highest eighteen years normal drought in Jessore and seventeen years normal drought was happened in Khulna and Patuakhali station. Bangladesh Meteorological Department Home; Service. In Pre-Kharif season, it was revealed that one-year extreme drought in Comilla, Faridpur and Mymensingh stations; two years severe droughts in Comilla, Dhaka, Faridpur and Tangail stations; six years moderate droughts in Madaripur station and maximum sixteen years normal droughts was occurred in Dhaka and Comilla stations. Figure 4: Percentage of drought area in Rabi season over different regions of Bangladesh (a) Central Region (CR), (b) Eastern Region (ER), (c) Southern and Western Region (SWR) and (d) Northern Region (NR). In addition, four years moderate drought was prevailed in Barisal, Khulna and Satkhira during rabi seasons (Table 2). Meteorol Appl 19: 256–264, Performance of drought indices for ecological, agricultural, and hydrological applications. Figure 3: Percentage of drought area in Kharif season over different regions of Bangladesh (a) Central Region (CR), (b) Eastern Region (ER), (c) Southern and Western Region (SWR) and (d) Northern Region (NR). In 2014, drought shifted to central and eastern region and affected about 57% of the study area by severe and moderate drought conditions. Monthly precipitation data of 35 meteorological stations were taken from Bangladesh Meteorological Department for a maximum period of 36 years from 1980 to 2015. On the other hand, the north-western region was the most vulnerable region of the country  which experienced most severe drought because of high variability in rainfall . The most significant increasing trend of drought was found in Rabi season with a rate of 8.66% per 10 years and Pre-Kharif season with a rate of 2.57% per 10 years. Go to resource. List of Scientist; List of Engineers; AWS Data; WB Project. Major finding of this study was Pre-Kharif and Rabi season were the most vulnerable to meteorological drought that indicates high seasonal rainfall anomaly in most of the regions of Bangladesh. The most common first order two states Markov Chain Model  was used to assess the dry and wet periods of all studied stations. In general drought is classified as meteorological, agricultural and hydrological droughts which are differing from one another by depending on intensity, duration and spatial coverage . Because of the country's location in the tropical monsoon region, the amount of rainfall is very high. Whereas five years moderate drought was appeared in Satkhira. The drought index of the study area was calculated in three different cropping seasons namely Pre-Kharif, Kharif and Rabi. Content of this site is available under Creative Commons Attribution 4.0 License Copyright © (2018) Identification of Meteorological Drought Prone Area in Bangladesh using Standardized Precipitation Index. BMD Service Users List; Organogram; Contact Us . DataApp; On Line Data Purchase; Jobs; Result; Headquarter & Other Stations; About Us. It is the principal agency responsible for meteorological observations, weather forecasting and seismology. Figures 1-3 presented the changes and linear trends of drought areas (SPEI ≤ 1) from 1980 to 2015 over three cropping seasons (Pre- Kharif, Kharif and Rabi) of different regions of Bangladesh. If m is the number of zeros in a precipitation time series and n is the number of precipitation observations. The highest percentage (47.22%) of dry period was found in Bogra whereas 44.44% was found in Rajshahi and Rangpur. Unusual rainfall … Climate Report; Report on Roanu; Report on MORA; Newsletter. During Kharif season, T. Aman rice is tremendously affected by drought whereas in Rabi and pre-kharif season; wheat, potato, mustard and T. Aus rice are mainly affected. After that, obtained SPI value was classified according to the drought classification of World Meteorological Organization (Table 1). She found that all the three methods identified the same drought years in the N-W region of Bangladesh. taf vghs 090500z 0906/1012 35005kt 2000br sct012 becmg 0914/0916 36005kt 1000br sct010 tempo 0923/1003 00000kt 0500fg bkn005 becmg 1004/1006 34005kt 1500br sct012= The SPI value for 3-months, 4-months and 5-months’ time scales have been calculated from 1980 to 2015 for 35 meteorological stations. Bangladesh Meteorological Department Home; Service. Bangladesh Meteorological Department Home; Service. In Pre-Kharif season, moderate, severe and extreme drought events were occurred about 41% of total area in 1995 and affected northern, south-western and few eastern regions which covered by Rajshahi, Dinajpur, Rangpur, Bogra, Jessore, Chuandanga, Sylhet, Bhola and its neighborhood areas (Figure 6). Field Value; Modified Date: 2018-05-10. Meteorological drought assessment of northern region. Thorn  found the gamma distribution to fit climatological precipitation time series well. Open Access Journals gaining more Readers and Citations, Meteorological Drought Index Mapping in Bangladesh Using Standardized Precipitation Index during 1981–2010, Advances in Meteorology, Application of standardized precipitation index to assess meteorological drought in Bangladesh. Meteorological drought simultaneously affects the agricultural productivity, deficit of soil moisture, ground water level and socio-economic problems in a drought affected region. To find out SPI value; 3-month rainfall data of pre-kharif season, 4-month data of Rabi season and 5-month data of season were analyzed through R programing software. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. (12.12.2020) Weather is generally fair over the Andaman sea and North Bay and a few cloud to partly cloudy elsewhere over the Bay of Bengal. Among these 34 stations, only two stations, Sylhet and Srimangal, observe rainfall in the northeastern zone which lies in the Meghna basin. To analyze the variations of the drought areas, linear regression methods were used to detect the changing trend of the annual percentage of drought area at different significance levels for the different regions of Bangladesh. 3)Climatological Summery of Bangladesh 4)Impact of climate change in Bangladesh 5)Description of winter 6)Rainfall analysis 7)Temperature analysis 8)Prediction. For monitoring drought, there are various indices that measure how much precipitation for a given period of time has deviated from historically established norms. The BMD observation network density is low, in some cases observation sites are located about 25km apart, whereas theseare about 145kmapartinsomeothersareas (Figure 1).Anumberofgrids In a year, the rainfall is 2022 mm | 79.6 inch. Conversely, in moderate drought prone areas, yield losses fluctuate from 20 to 35 percent . Preprints, Eight Conferences on Applied Climatology. The meteorological information of Chandpur, Comilla, Dhaka, Faridpur, Madaripur, Mymensingh and Tangail stations were evaluated to assess the meteorological drought of central region. Also, all of the stations were shown the dry period ranges from 41.67% to 50.00%. Daily Rainfall Data 1007. • Bangladesh Meteorological Department is a government organization under the administrative control of the Ministry of Defence. Data Views The climate is tropical in Dhaka. List of Scientist; List of Engineers; AWS Data; WB Project. Jalpa and Parekh  studied various drought indexes and concluded that SPI permits comparisons over space and time better than any other index. In Pre-Kharif season, Sitakunda faced the highest two years extreme drought, Sylhet, Cox’s Bazar and Teknaf faced four years severe droughts, Kutubdia confronted highest six years moderate droughts and Sitakunda faced sixteen years normal droughts of total drought years. It is mainly focused on the development of models for long term rainfall prediction of Bangladesh divisions and districts (Weather Stations). Early drought delays transplanting as well as harvesting time of aman rice which affects the cultivation of rabi crops after T. Aman. SPI values of 35 meteorological stations have been determined then with these SPI value point shape file prepared by ArcGIS10 software. The most significant increasing trend of drought area was found in Rabi season and decreasing trend was found in Kharif season. DataApp; On Line Data Purchase; Jobs; Result; Headquarter & Other Stations; About Us. Rainfall. Drought years, which were defined as years with drought percentage more than 40%  showed different variation patterns in different regions. From these three seasons the highest percentage of dry period was found in Pre-Kharif season. Among them the highest dry period percentage (55.56%) was found in Sitakunda (Table 2). 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