FIG. 14: 200 mb streamfunction anomalies during (a) August, (b) September and (c) October. The contour interval is 5 x 10⁶ m²s^-1, with positive (negative) values dashed (solid) and values greater (less) than 5 (-5) x 10⁶ m²s^-1 shaded dark (light). The non-divergent component of the flow is directed along the streamfunction contours with a speed proportional to the gradient. Thus, high (low) streamfunction values correspond to high (low) geopotential heights. Anomalies are departures from the 1979-1995 base period means.