980816.fig.001a
(a)
980816.fig.001b
(b)
980816.fig.001c
(c)
980816.fig.001d
(d)
Figure 1: Zonal mean variables for strong, normal, and weak HC cases: (a) meridional wind (ms−1) at 200 hPa, (b) zonal wind (ms−1) at 200 hPa, (c) omega (Pa/s) at 500 hPa, and (d) divergence (×10−6 s−1) at 200 hPa.