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

Osei, Marian Amoakowaah ORCID: https://orcid.org/0000-0003-3481-7222; Aryee, Jeffrey N.A.; Agyekum, Jacob; Ashong, Jesse; Ansah, Samuel Owusu; Ahiataku, Maureen Abla; Baffour‐Ata, Frank; Amekudzi, Leonard K.; Atiah, Winifred Ayinpogbilla; Padi, Michael; Ameho, Johnson; Yahaya, Bashiru; Portuphy, Joseph; Lamptey, Benjamin. 2023 Environment of severe storm formations over West Africa on the 26‐28 June 2018. Meteorological Applications, 30 (1), e2109. 20, pp. https://doi.org/10.1002/met.2109

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Official URL: http://dx.doi.org/10.1002/met.2109

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/met.2109
UKCEH and CEH Sections/Science Areas:	UKCEH Fellows
ISSN:	1350-4827
Additional Information. Not used in RCUK Gateway to Research.:	Open access paper - full text available via Official URL link.
Additional Keywords:	atmospheric convection, boundary layer dynamics, GCRF African SWIFT, gravity waves, mesoscale convective systems
NORA Subject Terms:	Meteorology and Climatology
Related URLs:	Dataset Dataset
Date made live:	02 Nov 2023 11:42 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/535347

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1002/met.2109

UKCEH and CEH Sections/Science Areas:

UKCEH Fellows

ISSN:

1350-4827

Additional Information. Not used in RCUK Gateway to Research.:

Open access paper - full text available via Official URL link.

Additional Keywords:

atmospheric convection, boundary layer dynamics, GCRF African SWIFT, gravity waves, mesoscale convective systems