ATOC 181 Lecture 9: Class 9 Cyclones
17 Feb 2019
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Document Summary
Temperature differences in the upper atmosphere control pressure differences in the upper atmosphere. Pressure differences in the upper control the jetstream winds. Regions of divergence and convergence in the upper control pressure change near the surface. Where temperature contrast are the greatest, jetstream"s winds are the strongest. Surface high pressure and low pressure systems form near the air mass boundaries where temperature contrast and the larger. Norwegian cyclone model --> cycle of the storm. This model: there is a boundary, or front separating warm air to the south from cold air to the north. Stationary front: a boundary that does not move. Where there is divergence we develop a low pressure system along the boundary. A wave on the front will form as an upper level disturbance in the jet stream moves over the front. The front develops a kink where the wave id developing. Precipitation will begin to develop with the heaviest occurrence along the front.
