Trend - Akademi Sains Malaysia

ANNUAL TIME SCALE – Trends in heavy rainfallin the annual time scale‣ Most of the regionally averaged indices show increasing trends (only afew are statistically significant).‣ The total amount of rainfall is showing marginally increasing trend inPM, while in EM the increasing trend is statistically significant. Forboth regions, CWD is decreasing and CDD is increasing.‣ The total rainfall on the extreme rainfall days are showing upwardtrends in both regions. Spatial variation based on trends at individualstation shows majority of the stations having increasing trends in theintensity though not statistically significant.‣ Thus there is generally a consistency between indices suggesting that theregionally averaged rainfall intensity (SDII) has increased along withthe regionally averaged amount of rainfall on extreme rainfall days andthe frequency.