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FIG. 23. Seasonal 200-hPa streamfunction (contours) and anomalies (shaded) during (a) DJF 1998–99, (b) MAM 1999, (c) JJA 1999, and (d) SON 1999. Units are 1.0 x 10-6 m2 s-1. Contour interval is 10. In the Northern Hemisphere, positive (negative) values indicate an anticyclonic (cyclonic) circulation. In the Southern Hemisphere, negative (positive) values indicate a cyclonic (anticyclonic) circulation. Anomalies are departures from the 1979–95 base period means.