Articles | Volume 5, issue 3
https://doi.org/10.5194/wcd-5-1187-2024
https://doi.org/10.5194/wcd-5-1187-2024
Research article
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30 Sep 2024
Research article | Highlight paper |  | 30 Sep 2024

The crucial representation of deep convection for the cyclogenesis of Medicane Ianos

Florian Pantillon, Silvio Davolio, Elenio Avolio, Carlos Calvo-Sancho, Diego Saul Carrió, Stavros Dafis, Emanuele Silvio Gentile, Juan Jesus Gonzalez-Aleman, Suzanne Gray, Mario Marcello Miglietta, Platon Patlakas, Ioannis Pytharoulis, Didier Ricard, Antonio Ricchi, Claudio Sanchez, and Emmanouil Flaounas

Data sets

Model intercomparison of medicane Ianos using ten mesoscale numerical frameworks Florian Pantillon et al. https://doi.org/10.5281/zenodo.13342189

Complete ERA5 from 1940: Fifth generation of ECMWF atmospheric reanalyses of the global climate H. Hersbach et al. https://doi.org/10.24381/cds.143582cf

Model code and software

Overview of the Meso-NH model version 5.4 and its applications (http://mesonh.aero.obs-mip.fr/) Christine Lac et al. https://doi.org/10.5194/gmd-11-1929-2018

A Description of the Advanced Research WRF Version 3 (No. NCAR/TN-475+STR) (https://github.com/wrf-model/WRF/releases) William C. Skamarock et al. https://doi.org/10.5065/D68S4MVH

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Executive editor
High-impact medicanes, like Ianos September 2020, are occasionally poorly predicted by operational numerical weather prediction models, and it is therefore very important to understand the factors that limit their predictability and to eventually improve predictions. The well-written study by Pantillon et al. investigates simulations of medicane Ianos performed with 10 model setups, using different models, horizontal grid spacings, and representations of moist convection. Their results highlight the critical importance of a high-resolution representation of moist convection, and the coupling of convective and baroclinic processes in the cyclogenesis phase of the medicane. These results from the major modelling undertaking in this study have important ramifications also for practical forecasting.
Short summary
Cyclone Ianos of September 2020 was a high-impact but poorly predicted medicane (Mediterranean hurricane). A community effort of numerical modelling provides robust results to improve prediction. It is found that the representation of local thunderstorms controlled the interaction of Ianos with a jet stream at larger scales and its subsequent evolution. The results help us understand the peculiar dynamics of medicanes and provide guidance for the next generation of weather and climate models.