Synoptic Analysis of a Heavy Rainfall Event over Southeast Region of Bangladesh Using WRF Model

Ahasan, M. N.; Mannan, Md. Abdul; Debsarma, Sujit Kumar

doi:10.3329/jsr.v5i3.13171

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…WRF model was used to understand how topography and land surface conditions affect the extreme convection in western and eastern Himalayas [5]. Studies have been conducted so far in Bangladesh using WRF model [6] simulated WRF using KF (Kain Fretch) as cumulus and YSU as PBL (planetary boundary layer) scheme to understand heavy rainfall over Bangladesh. Kumar, et al [7] performed a simulation of high impact rainfall events over the whole Indian subcontinent to analyze the performance of physical options of WRF model.…”

Section: Climate Of Egyptmentioning

confidence: 99%

A Comparative Study of Two Extreme Cases Hit Egypt in January 2008 and 2009 Using WRF Different Convective Schemes

Ibrahim¹

2020

BJSTR

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Heavy rainfall associated with severe flash floods cause loss of life and property. Forecasting of these severe weather events is highly essential because of their impacts on infrastructure and life over Egypt. Sinai Peninsula and sometimes southern parts are more affected by frequent heavy rainfall during the last decade in January. Early warning of these events will contribute avoiding destructive effects. WRF model was run with three convective cumulus schemes (Kain-Fritsch, Grell-Devenyi and Betts-Miller-Janjic) to simulate rainfall during January 14-19 in 2008 and 2009 over Egypt. The run of the model was done based on two nest domains at horizontal resolution of 27 km for mother domain and 9 km for nest domain to establish the best scheme that simulates rainfall better than the other two schemes during the period of study over the country. After comparing rainfall from these convective schemes with corresponding daily-clim reanalysis, Grell among the chosen cumulus convective schemes was found to give better results compared to other cumulus schemes along the period of the study. Synoptic study of these two cases was conducted. It is found that the extreme rainfall events were due to amalgamation between tropical and mid latitudes pressure systems.

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Section: Climate Of Egyptmentioning

confidence: 99%

A Comparative Study of Two Extreme Cases Hit Egypt in January 2008 and 2009 Using WRF Different Convective Schemes

Ibrahim¹

2020

BJSTR

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“…Application of NWP model in monsoon weather research and forecasting is very little in Bangladesh due to limitation of computing platform and technical knowledge. In spite of the limitations, some works have been done on heavy rainfall during summer monsoon season of Bangladesh using NWP model (e.g., [12][13][14][15][16][17][18]) which are summarized below. Prasad [12] has carried out the study entitled "Monsoon forecasting with a limited area numerical weather prediction systems. "…”

Section: Introductionmentioning

confidence: 99%

“…He studied the synoptic features responsible for occurring such unusual storms during monsoon season by using Radar data and WRF mesoscale model. Ahasan et al [15][16][17][18] have studied some cases (e.g., 11 June, 2007, 14 September, 2004, 07 September, 2011, etc.) on heavy rainfall over Bangladesh using MM5 and WRF model for understanding the synoptic situations and developing the prediction techniques.…”

Section: Introductionmentioning

confidence: 99%

Simulation of High Impact Rainfall Events Over Southeastern Hilly Region of Bangladesh Using MM5 Model

Ahasan

Chowdhury

Quadir

2013

International Journal of Atmospheric Sciences

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Simulation of high impact rainfall events over southeastern hilly region of Bangladesh has been carried out using Fifth-Generation PSU/NCAR Mesoscale Model (MM5) conducting two historical rainfall events, namely, 21 June, 2004 and 11 July, 2004. These extraordinary rainfall events were localized over the Rangamati region and recorded 304 mm and 337 mm rainfall on 21 June, 2004 and 11 July, 2004, respectively, over Rangamati within a span of 24 h. The model performance was evaluated by examining the different predicted and derived parameters. It is found that the seasonal monsoon trough has northerly position compared to normal and pass through Bangladesh extending up to northeast India for both cases. The heat low was found to be intense (996 hPa) with strong north-south pressure gradient (12–15 hPa). The analysis of the geopotential height field at 200 hPa shows that the Tibetan high is shifted towards south by 7-8° latitudes with axis along 22–25°N for both cases. The analysis of the wind field shows that the areas of high impact rainfall exhibit strong convergence of low level monsoon circulation (~19–58 knots). The strong southwesterlies were found to exist up to 500 hPa level in both cases. The lower troposphere (925–500 hPa) was characterized by the strong vertical wind shear (~9–18 ms−1) and high relative vorticity (~20–40 × 10−5 s−1). The analysis also shows that the areas of high impact rainfall events and neighbourhoods are characterized by strong low level convergence and upper level divergence. The strong southwesterly flow causes transportation of large amount of moisture from the Bay of Bengal towards Bangladesh, especially over the areas of Rangamati and neighbourhoods. The high percentage of relative humidity extends up to the upper troposphere along a narrow vertical column. Model produced details structure of the spatial patterns of rainfall over Bangladesh reasonably well though there are some biases in the rainfall pattern. The model suggests that the highly localized high impact rainfall was the result of an interaction of the mesoscale severe convective processes with the large scale active monsoon system.

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Evaluation of Microphysics and Cumulus Schemes of WRF for Forecasting of Heavy Monsoon Rainfall over the Southeastern Hilly Region of Bangladesh

Hasan

Islam

2018

Pure Appl. Geophys.

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Synoptic Analysis of a Heavy Rainfall Event over Southeast Region of Bangladesh Using WRF Model

Cited by 5 publications

References 4 publications

A Comparative Study of Two Extreme Cases Hit Egypt in January 2008 and 2009 Using WRF Different Convective Schemes

A Comparative Study of Two Extreme Cases Hit Egypt in January 2008 and 2009 Using WRF Different Convective Schemes

Simulation of High Impact Rainfall Events Over Southeastern Hilly Region of Bangladesh Using MM5 Model

Evaluation of Microphysics and Cumulus Schemes of WRF for Forecasting of Heavy Monsoon Rainfall over the Southeastern Hilly Region of Bangladesh

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