Abstract
Abstract This paper describes the life cycle of a lee trough associated with the passage of a baroclinic wave over the Rocky Mountains based on two overlapping simulations by the Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model. The evolution of the lee trough may be summarized as follows. A surface cyclone and lee trough developed and intensified as an upper-level short-wave trough approached and moved over the Rockies. Near the low center,.the lee trough was found to be frontogenetical, with the frontogenesis being forced by 1) confluent deformation associated with the wind fields of the developing cyclone and lee trough and 2) differential vertical motion along the eastern slopes of the Rocky Mountains and the adjacent sloping terrain of the High plains. In turn, the frontogenesis drove an ageostrophic circulation that sharpened the lee trough. The lee trough represented a break in trajectory origin, with trajectories ending ahead of the lee trough originating over...
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