Three additional steps to gain insight into possible reasons for the seasonal and geographic fluctuations of 100 mm days
Gridded climatological data were retrieved from the NCEP reanalysis project (1961-1990) and a 21-day smoother of a daily-mean climatology was used for the norms.
Surface and 500h analyses were inspected for each 100 mm day
days and states that were affected by named tropical systems or their remains were identified and listed