FIG. 19. Outgoing longwave radiation (OLR) anomalies (shaded) and 850-hPa vector wind
anomalies and isotachs for (a) DJF 1998/99, (b) MAM 1999, (c) JJA 1999, and d) SON 1999.
Contour interval for isotachs is 2 m s-1. Shading interval for OLR anomalies is
10 W m-2. Anomalies are departures from the 197995 base period monthly