Abstract
Relation of shape and size of coastal line to coastal rainfall mechanism over Indonesian Maritime Continent (IMC) is not clearly understood. Cendrawasih Bay is a unique coastal line because it is the biggest curvature type in IMC, near equatorial lines and semi-closed oceans. The mechanism of nocturnal rainfall over Cendrawasih Bay has been studied using data from Tropical Rainfall Measuring Mission Precipitation Radar (TRMM-PR) 3B42 product over during 1998–2015. Correlation coefficient of TRMM-PR and observational data from Biak Meteorological Station in 2014 is 0.6. Composite TRMM-PR data showed that nocturnal rainfall over the Cendrawasih Bay began to form at midnight and has peak intensity after midnight. Rain rate intensity over the Cendrawasih Bay is bigger than over inland and adjacent waters with speed of rainfall migration is approximately 5 m/s. Northern monsoon flows and land breeze along curvature coast induced low level convergence over Cendrawasih Bay during late evening until morning.
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