584257.fig.001a
(a)
584257.fig.001b
(b)
584257.fig.001c
(c)
584257.fig.001d
(d)
Figure 1: The NCEP-NCAR reanalyses for the Northern Hemisphere 500 hPa heights for (a) May, (b) June (20–30), (c) July, and (d) August (1–20), 2010. The contour interval is 60 dam.