EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Simulation of a subtropical cyclone using the HARMONIE-AROME model

Mariano Sastre1,2, Javier Díaz Fernández1, Lara Quitián Hernández1, Pedro Bolgiani1, Daniel Santos-Muñoz3, Juan Jesús González-Alemán1, Francisco Valero1, Luis Ignacio Sebastián-Martín2, Laura López4, José Ignacio Farrán2, and María Luisa Martín2
Mariano Sastre et al.
  • 1Department of Earth Physics and Astrophysics, School of Physics, Universidad Complutense de Madrid, Madrid, Spain (
  • 2Department of Applied Mathematics, School of Computer Engineering, Universidad de Valladolid, Segovia, Spain
  • 3High Resolution Limited Area Model Consortium (HIRLAM). Agencia Estatal de Meteorología (AEMET), Madrid, Spain
  • 4Atmospheric Physics Group, IMA, Universidad de León, León, Spain

According to their thermal structure and dynamics, different types of tropospheric cyclones can be defined. Subtropical cyclones (STC) are low pressure systems that share tropical and extratropical characteristics, having a hybrid thermal structure. The impacts of this kind of cyclones are typically like the ones due to tropical storms or even hurricanes, leading to widespread social damage and significant economic losses. Moreover, because of its complex dynamics and rapid intensification, these systems remain a phenomenon of interest, as well as a challenge in terms of prediction. Consequently, effective numerical model simulations become the key tool in order to reliably forecast these extreme events. In this study, a STC event, which occurred in October 2014 nearby the Canary Islands, is assessed by means of the high-resolution numerical weather prediction model HARMONIE-AROME, which is currently operated at 2.5 km grid resolution. This model was developed in the framework of the collaboration of the ten European National Meteorological Services that belong to the HIRLAM international research consortium, together with the sixteen countries that comprise the ALADIN consortium. To evaluate the performance of the simulation, airport observations and sounding data in the vicinity of the STC are considered for local analyses, and satellite images are used to assess the global cloudiness arrangement.

How to cite: Sastre, M., Díaz Fernández, J., Quitián Hernández, L., Bolgiani, P., Santos-Muñoz, D., González-Alemán, J. J., Valero, F., Sebastián-Martín, L. I., López, L., Farrán, J. I., and Martín, M. L.: Simulation of a subtropical cyclone using the HARMONIE-AROME model, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15665,, 2021.


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