Despite important scientific advances on the knowledge of weather phenomena, research on cyclones, hurricanes and thunderstorms continues intensively to determine physical laws that govern their thermodynamics and dynamics. Given the fact that saturated water vapor is known as the birthplace of meteorological events such as clouds and electrical or thermodynamic processes related, we want to make a contribution to a better understanding of tropical depressions by revealing the impacts of thermoelastic properties of this birthplace on major tropical disturbances kinematics. Our results are based on Clausius-Clapeyrons’ formulas which show precisely that, unlike dry water vapor that can be assimilated to the ideal gas at all circumstances, saturated water vapor has, in an air parcel at the same time very cold (temperatures below 0.0098° C) and rich in moisture (vapor pressure above 6.11 mb), thermoelastic properties diametrically opposed to those of ideal gas (including dry water vapor). Vertical profiles of temperature and water vapor in the troposphere leads to localization of the air parcel in which the ideal gas assumption should be banned, hence the appropriate kinematics of cyclones and hurricanes.
