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In this paper was calculated the return period of coastal floods for each of the coastal settlements that report this extreme event in the Cuban archipelago, based on the period 1901-2020. The chronology and classification of coastal floods for each province was used, as well as the Poisson distribution and the χ² goodness of fit test. It is concluded that the Poisson distribution was suitable in all cases for the significance level of 5%; while the greatest hazard is presented by Havana, Baracoa and the settlements of the Gulf of Batabanó in which the occurrence of a flood event is expected at least once every three to five years. [ABSTRACT FROM AUTHOR]

A general description of the oceanic active layer in the sea around Cuba is presented, taking into account the vertical distribution of temperature, salinity and conditional density. The homogenius layer thickness by temperature, salinity and density, the active layer lower limit and the thermocline gradient were determined. The depth localization of the 26°C-isotherm, of particular importance for the tropical cyclones development, was obtained. The relation between the active layer characteristic variation and the meteorological element cycles was described. The possible connection between the obtained results, the cyclogenetical zones and the ENOS event was considered. Although in presence of the event ENOS, the maximum values of temperature and isothermic layer thickness are observed, the cyclonal activity diminishes due to the increment of the atmospheric vertical shear. The principal conclusion is that the oceanic active layer in the sea around Cuba, presents the most favorable characteristics to the tropical cyclone development toward the western half of the country and from final of August until principles of November, being October the most marked month, with water temperatures over 28°C and isothermic layer thickness over 50 m. The results were illustrated with tables and figures. [ABSTRACT FROM AUTHOR]