Supersonic flows cannot be calculated using the classical Reynolds analogy, which must be replaced with a more specific one. The ‘strong Reynolds analogy’, due to Young and Morkovin, fulfills this role approximately if the wall is quasi-adiabatic, but not if a significant heat flux is present. To overcome this situation, another more general representation is proposed. Based on results involving the role of large-scale movements present in the boundary layer, this schematic model draws a relationship between temperature and velocity turbulent intensities and mean flow characteristics, while also examining the role of compressibility in turbulent motion.