the situation, the relative vorticity is decreasingdownstream. We may state that surface pressure fallswhere relative vorticity decreases downstream in theupper troposphere, or where advection of more cyclonicvorticity takes place aloft. The converse of this is in thecase of convergence aloft.SUMMARYIn this chapter we expanded on the subjects ofconvergence, divergence, and vorticity, which were firstpresented in the AG2 manual, volume 1. Our discussionfirst dealt with convergence and divergence as simplemotions. The dynamics of convergent and divergentflow was covered, along with a discussion of winddirectional shear and wind speed shear. Convergenceand divergence as complex motions were thenpresented. Rules of thumb on convergence anddivergence relative to surface and upper air featureswere covered. The last portion of the chapter dealt withvorticity. Definitions of relative vorticity and absolutevorticity were covered. Vorticity effects on weatherprocesses was the last topic of discussion.1-11
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