Schematic illustration of the wavenumber-2 asymmetry induced on the barotropic vortex in cyclonic shear. The cyclonic and anticyclonic streamfunction gyres are shown in red and blue, respectively. The hurricane symbol marks the center of the vortex, and the sense of the primary circulation is shown in pink. Note the correlations between inflow and cyclonic perturbation tangential wind and between outflow and anticyclonic flow. The black circle is at 2000 km radius