Environment of severe storm formations over West Africa on the 26-28 June 2018

被引:2
|
作者
Osei, Marian Amoakowaah [1 ,2 ,3 ,10 ]
Aryee, Jeffrey N. A. [1 ]
Agyekum, Jacob [1 ,4 ]
Ashong, Jesse [5 ]
Ansah, Samuel Owusu
Ahiataku, Maureen Abla
Baffour-Ata, Frank [6 ]
Amekudzi, Leonard K. [1 ]
Atiah, Winifred Ayinpogbilla [1 ]
Padi, Michael [7 ]
Ameho, Johnson [7 ]
Yahaya, Bashiru [8 ,9 ]
Portuphy, Joseph
Lamptey, Benjamin
机构
[1] Kwame Nkrumah Univ Sci & Technol, Dept Meteorol & Climate Sci, Kumasi, Ghana
[2] Ctr Ecol & Hydrol, Crowmarsh Gifford, Oxon, England
[3] Univ Leeds, Sch Earth & Environm, Leeds, England
[4] Ctr Sci & Ind Res, Water Res Inst, Accra, Ghana
[5] Ghana Meteorol Agcy, Dept Hydrometeorol, Accra, Ghana
[6] Kwame Nkrumah Univ Sci & Technol, Dept Environm Sci, Kumasi, Ghana
[7] Ghana Civil Aviat Author, Air Nav Serv, Safety Dept, Accra, Ghana
[8] Complex & Climate Leibniz Ctr Trop Marine Res, Bremen, Germany
[9] Jacobs Univ, Dept Earth Sci, Bremen, Germany
[10] Ctr Ecol & Hydrol, Crowmarsh Gifford OX10 8BB, Oxon, England
基金
英国科研创新办公室;
关键词
atmospheric convection; boundary layer dynamics; GCRF African SWIFT; gravity waves; mesoscale convective systems; MESOSCALE CONVECTIVE SYSTEMS; GRAVITY-WAVES; RAINFALL; PROPAGATION;
D O I
10.1002/met.2109
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Understanding the environmental evolution of mesoscale convective systems (MCSs) is critical for forecasting weather in West Africa. This study investigated the thermodynamic and synoptic environments of MCSs over West Africa on 26 (storm 1) and 28 (storm 2) June 2018. Primary datasets used to assess the diurnal evolution of the storms were obtained from ERA5. The results showed a trapped gravity wave, enhanced by a well-established African Easterly Jet and monsoon trough, was responsible for the initiation of storm 1. Both storms also initiated in the presence of several moist lower (925-850 hPa) to mid-tropospheric (600 hPa) cyclonic and anticyclonic vortices, controlling inland moisture advection. The lower troposphere was moistened through moisture advection by the West African westerly jet for storm 1 and the nocturnal low-level jet prior to initiation for storm 2. For both storms, the evolution of outgoing longwave radiation showed a consistent atmosphere of deep afternoon convection. Boundary layer height increased significantly during storm evolution to support the increasing ascent of warm air. Vegetation cover differences may have also likely aided the evolution of storm 2. The passage of gravity waves from decaying storms can aid forecasters to nowcast likely regions of afternoon convection with high accuracy. Under the GCRF African Science for Weather Information and Forecasting Techniques (SWIFT), these findings are crucial in fulfilling the project's aims of improving weather forecasting capability and communication over West Africa.
引用
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页数:20
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