Changes in extreme weather and climate events have significant impacts and are among the most serious challenges to society in coping with a changing climate. Since the extreme weather events are becoming a frequent and hitting issue for livings and non-livings. World Meteorological Organization (WMO) emphasizes the importance of the studies relevant to the above stated phenomena and motivates the countries providing necessary indices and guidelines on analyzing these weather extremes. Sri Lanka is also undergoing these weather extremes and among them severe rainfall hazards are one of the frequent weather hazards in the country. These events incur vast damages to many sectors. Therefore it is a timely important need to identify the spatial and temporal dynamics of rainfall extremes over the country to conclude the frequency and the intensity of extreme rainfall events. This also identifies the most vulnerable areas to these extremes and analyzes the temporal and spatial patterns identifying the significance of the trends.

R.M.Shashini Saumya Sanjeewani, lecturer, Department of Transport and Logistics Management, Faculty of Engineering, University of Moratuwa, Sri Lanka. B.A Hons (Geography),University of ColomboLasantha Manawadu, Professor in Geography, Faculty of Arts, University of Colombo, B.A Hons (Colombo), M.Sc.in Geoinformatics(Thailand) P.hD (Colombo)