FIG. 31. August–September mean
200–850-hPa vertical wind shear (shaded, m s-1), overlaid with (a, c)
600-hPa zonal wind (contours, interval is 2 m s-1) and (b, d) 600-hPa cyclonic
relative vorticity (contours, interval is 2x10-6 s-1). Panels (a, b)
show 1979–95 climatological mean conditions and panels (c, d) show 1999 mean
conditions.
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