Abstract
A multi-level diagnostic model is used to study the physical and dynamical mechanisms that produce low-level clouds and light precipitation within the cold air sector on the west side of a Midwest cyclone. Computational results show frictional effects to be the primary mechanism in the absence of secondary upper level trough mechanisms or intense heating from the underlying surface. Also, this study shows that the vertical motion field may be substantially modified by secondary effects when the usually dominant contributions by vorticity and thermal effects are weak.
