Atmospheric frontogenesis models: Some solutions

In this paper are presented some solutions of analytic models in which large-scale velocity fields act on initially large-scale distributions of temperature. Phenomena very similar to atmospheric fronts both surface and upper tropospheric are described. At the surface front there is a tendency to form discontinuities in velocity and temperature in a finite time. The upper tropospheric front and its jet stream are associated with the descent of a tongue of stratospheric air. The main assumption underlying the models is the justifiable one of geostrophic balance across but not along the front.