@article{Ahasan_Mannan_Debsarma_2013, title={Synoptic Analysis of a Heavy Rainfall Event over Southeast Region of Bangladesh Using WRF Model}, volume={5}, url={https://banglajol.info/index.php/JSR/article/view/13171}, DOI={10.3329/jsr.v5i3.13171}, abstractNote={<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves /> <w:TrackFormatting /> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF /> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>AR-SA</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> <w:SplitPgBreakAndParaMark /> <w:DontVertAlignCellWithSp /> <w:DontBreakConstrainedForcedTables /> <w:DontVertAlignInTxbx /> <w:Word11KerningPairs /> <w:CachedColBalance /> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math" /> <m:brkBin m:val="before" /> <m:brkBinSub m:val=" " /> <m:smallFrac m:val="off" /> <m:dispDef /> <m:lMargin m:val="0" /> <m:rMargin m:val="0" /> <m:defJc m:val="centerGroup" /> <m:wrapIndent m:val="1440" /> <m:intLim m:val="subSup" /> <m:naryLim m:val="undOvr" /> </m:mathPr></w:WordDocument> </xml><![endif]--> <p class="MsoNormal" style="margin-top: 0cm; margin-right: 14.4pt; margin-bottom: .0001pt; margin-left: 14.4pt; text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 9.0pt;">Synoptic analysis of the heavy rainfall event of 7 September 2011 was carried out using the Weather Research and Forecasting (WRF) Model. This extraordinary rainfall event was localized over the southeast region of Bangladesh and recorded rainfall was 331 mm at Chittagong and 226 mm at Sandwip within a span of 24-h. <span style="mso-bidi-font-weight: bold;">The model was run at 9 km horizontal resolution using KF CPS with YSU PBL scheme. The model performance was evaluated by examining the different predicted parameters like mean sea level pressure, upper and lower level circulations, wind shear, relative vorticity, convergence, moisture and rainfall. The rainfall was validated with TRMM 3B42RT and observed rainfall data. The results indicate that the WRF model was able to simulate the heavy rainfall event, and associated synoptic features reasonably well, though there are some biases in the rainfall pattern. The results suggest that the highly localized heavy rain over southeast Bangladesh was the result of an interaction of the large scale monsoon system with cyclonic disturbances and required moisture have been supplied from the Bay of Bengal.</span> The low level flow facilitated strong convergence over the region due to horizontal wind shear, which resulted in maintenance of the storms.</span></p> <p class="MsoNormal" style="margin-top: 0cm; margin-right: 14.4pt; margin-bottom: .0001pt; margin-left: 14.4pt; text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 6.0pt; mso-bidi-font-size: 9.0pt; mso-bidi-font-weight: bold;"> </span></p> <p class="MsoNormal" style="margin-top: 0cm; margin-right: 14.4pt; margin-bottom: .0001pt; margin-left: 14.4pt;"><em style="mso-bidi-font-style: normal;"><span style="font-size: 9.0pt;">Keywords:</span></em><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 9.0pt;"> </span></strong><span style="font-size: 9.0pt;">Heavy Rainfall; WRF Model; Simulation; Validation; TRMM.</span></p> <p class="MsoNormal" style="margin-left: 14.2pt; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 4.0pt; mso-bidi-font-size: 8.0pt; mso-ansi-language: EN-SG; mso-fareast-language: EN-SG;" lang="EN-SG"> </span></p> <p class="MsoNormal" style="margin-left: 14.2pt; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 8.0pt; mso-ansi-language: EN-SG; mso-fareast-language: EN-SG;" lang="EN-SG">© 2013 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.</span></p> <p class="MsoNormal" style="margin-left: 14.2pt; tab-stops: 14.2pt 6.0cm 177.2pt 184.3pt;"><span style="font-size: 1.0pt; mso-bidi-font-size: 7.0pt; mso-ansi-language: EN-SG; mso-fareast-language: EN-SG;" lang="EN-SG"> </span></p> <p class="MsoNormal" style="margin-left: 14.2pt; tab-stops: 14.2pt 6.0cm 177.2pt 184.3pt;"><span style="font-size: 8.0pt;">doi: <a href="http://dx.doi.org/10.3329/jsr.v5i3.13171">http://dx.doi.org/10.3329/jsr.v5i3.13171</a> <span style="mso-spacerun: yes;"> </span>J. Sci. 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N. and Mannan, M. A. and Debsarma, S. K.}, year={2013}, month={Aug.}, pages={421–434} }