Figure 2. Time series (top left frame) of the total number of tropical cyclones in the Australian region (105-160E). Also shown are time series of the number of intense cyclones (with minimum pressures less than or equal to 970 hPa - top right frame), th e number of moderate cyclones (with pressures between 970 and 990 hPa - bottom left frame), and the number of weak cyclones (with minimum pressures greater than 990 hPa - bottom right frame). Linear trends for all time-series are shown as thick lines. Th e cyclone season starts around November and lasts until about May. The abscissa gives the year in which the cyclone season starts (eg., the 1969/70 season is plotted against "1969").