Figure 5. (a) An example of daily rainfall during June 1 till September 30 for 1988 (mm/day). Positive (negative) departures from long-term daily climatology are shaded blue (red) to highlight the active and break spells. (b) The power spectrum of 22 years (1990–2011) JJAS rainfall anomalies over the central India. 5% and 95% “red noise” confidence bounds are shown by green and red lines respectively. c) Amplitude of MISO as shown by climatological standard deviation of 10–90 day filtered precipitation (mm/day) during JJAS using TRMM rainfall data.