The occlusion process in a midlatitude cyclone over land

Abstract

A historical review highlights the lack of consensus regarding the structure and evolution of occluded fronts and cyclones. This paper and its companion examine a model simulation of the 14-16 December 1987 cyclone over the eastern United States. The structure of an occluded front was observed at low levels as the cold front caught up with the warm front, while aloft an upper-level frontal zone appeared to play a role in the occlusion process. Although the thermal structure of this storm suggested that a cold-type occlusion should have formed, the model simulation produced a warm-type occlusion structure. -from Authors