Fig. 4
Environmental conditions for hurricane formation. (a) Genesis potential index (GPI). (b) Planetary vorticity. (c) Long-term mean relative vorticity at 850 hPa. (d) Relative humidity at 600 hPa. (e) Potential intensity. (f) Vertical shear of the horizontal winds between 300 and 850 hPa. We note the environmental vorticity in panel c is one order smaller than the vorticity of hurricanes shown in Fig. 1d.
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