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Journal of Southern Hemisphere Earth Systems Science Journal of Southern Hemisphere Earth Systems Science SocietyJournal of Southern Hemisphere Earth Systems Science Society
A journal for meteorology, climate, oceanography, hydrology and space weather focused on the southern hemisphere
RESEARCH ARTICLE (Open Access)

Bulk cloud microphysical properties as seen from numerical simulation and remote sensing products: case study of a hailstorm event over the La Plata Basin

Angel Liduvino Vara-Vela https://orcid.org/0000-0002-4972-4486 A F * , Natália Machado Crespo A E , Éder Paulo Vendrasco B , Noelia Rojas Benavente A , Marcos Vinicius Bueno de Morais A C , Jorge Alberto Martins C , Vaughan Trevor James Phillips D , Fabio Luiz Teixeira Gonçalves A and Maria Assunção Faus da Silva Dias A
+ Author Affiliations
- Author Affiliations

A Departamento de Ciências Atmosféricas, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, São Paulo 05508-090, SP, Brazil.

B Center for Weather Forecasting and Climate Studies, National Institute for Space Research, Cachoeira Paulista, Brazil.

C Federal University of Technology – Parana, Avenida dos Pioneiros 3131, Londrina 86047-125, PR, Brazil.

D Department of Physical Geography, University of Lund, Solvegatan 12, SE-22362 Lund, Sweden.

E Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, CZ-180 00 Prague, Czechia.

F Department of Geoscience, Aarhus University, DK-8000 Aarhus, Denmark.

* Correspondence to: angel@geo.au.dk

Handling Editor: Steven Siems

Journal of Southern Hemisphere Earth Systems Science 74, ES23006 https://doi.org/10.1071/ES23006
Submitted: 8 April 2023  Accepted: 18 March 2024  Published: 1 May 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of the Bureau of Meteorology. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Hailstorms develop over the La Plata Basin, in south-eastern South America, more often during later winter and early austral spring, between September and October. These systems have significant socioeconomic impacts over the region. Thus, a better understanding of how atmospheric drivers modulate the formation of hailstorms is important to improve the forecast of such phenomena. In this study, we selected a hailstorm event observed over the eastern La Plata Basin during 14–15 July 2016 to evaluate the performance of the Brazilian developments on the Regional Atmospheric Modelling System (BRAMS) model. The ability of the model in simulating cloud microphysical properties was evaluated by comparing simulations driven by different global forcings against in situ and remote sensing observations. The model results showed good skill in capturing the basic characteristics of the thunderstorm, particularly in terms of the spatial distribution of hydrometeors. The simulated spatial distribution of hail covers locations where hail fall was reported. The BRAMS simulations suggest that, despite relatively low values of the convective available potential energy (CAPE) (700–1000 J kg−1), environments with strong 0–8-km bulk shear (60–70 kt, ~30.9–36.0 m s–1) can promote the formation of ice clouds and hail fall over the eastern La Plata Basin. To be more conclusive, however, further research is needed to understand how different combinations of CAPE and shear affect hail formation over the region.

Keywords: BRAMS model, cloud microphysics, hailstorms, La Plata Basin, numerical simulation, precipitation, remote sensing, SALLJ event.

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