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Analysis of possible physical factors that accelerate downdrafts in storm clouds over Cuba
Gleisis Alvarez * 1 , Mario Carnesoltas 2 , Alis Varela 2 , José Carlos Fernández 3, 4
1  Department of Meteorology, Higher Institute of Technologies and Applied Sciences, University of Havana, La Habana 10400, Cuba
2  Atmospheric Physics Center, Cuban Institute of Meteorology, Havana, Havana 10400, Cuba
3  Environmental Physics Laboratory (EPhysLab), CIM–UVigo, Universidade de Vigo, 32004 Ourense, Spain
4  Department of Meteorology, Higher Institute of Technologies and Applied Sciences, University of Havana, La Habana 10400, Cuba
Academic Editor: Anthony Lupo

10.3390/ecas2021-10321 (registering DOI)

Severe Local Storms (TLS) are considered one of the most dangerous phenomena within the mesoscale. One of its manifestations is strong linear winds, which are known as downbursts, capable of causing great losses to the country's economy and society in general. Knowing which factors in the atmosphere are necessary for the occurrence of this phenomenon is essential for its better understanding and future prediction, which is very complex given the short time of their emergence, development, and dissipation. The objective of the research was to analyze the possible physical factors that accelerate the downdrafts in the storm clouds in Cuba. For this, 10 simulated study cases simulated with the Weather Research and Forecasting (WRF) model at 3 km of the spatial resolution were used. Of these, there were 5 days with reports of downburst and 5 days close to these, both in position and time, in which there was an electrical storm without severity. The factors capable of discriminating between downburst and electrical storms without severity were obtained as the absorption of latent heat by evaporation and fusion, the equivalent potential temperature difference between the level of maximum relative humidity in the low levels and of minimum relative humidity in the middle levels, the speed of the downdraft, and Downstream Available Convective Potential Energy (DCAPE). Unlike previous research, they discriminated against updraft buoyancy and energy advection, both at the middle levels of the troposphere.

Keywords: Downburst, physical factors, WRF
Comments on this paper
Anthony Lupo
PDF - powerpoint
Interesting study - I was surprised by the discriminators between severe and non severe convection. Will use this work in my tropical class.

Jose Fernandez
Dear Professor Anthony Lupo, thank you very much for your comment. We are pleased that our work will help you in your classes. These results are part of Glesis's (first author) undergraduate thesis, which will be published in a journal soon. Kind regards.