695067.fig.007a
(a)
695067.fig.007b
(b)
695067.fig.007c
(c)
695067.fig.007d
(d)
Figure 7: As in Figure 5, but for mean geopotential height at 500 hPa. Contours interval is 10 gpm in (a) and (c) and 2 gpm in (b) and (d). Negative contours are dotted.