294956.fig.005a
(a)
294956.fig.005b
(b)
294956.fig.005c
(c)
294956.fig.005d
(d)
294956.fig.005e
(e)
294956.fig.005f
(f)
Figure 5: 500 hPa potential vorticity (shaded in every 0.5 PVU, 1 PVU = 10-6 K kg−1 m2 s−1) and geopotential height (blue contours every 60 m) from the CTRL experiment in every 12 hours: (a) 00Z September 15, 1999, (b) 12Z September 15, 1999, (c) 00Z September 16, 1999, (d) 12Z September 16, 1999, (e) 00Z September 17, 1999, and (f) 12Z September 17, 1999.