However, the maximum correlation between daily trade wind rainfall and trade wind speed is <0.3. Daily orographic rainfall over Oahu is greater under the strong trade wind regime, and less under weak trade wind and variable-wind flow regimes. Precipitation on the western leeside coast has a slight peak in the afternoon due to an increase of cloud development from the afternoon sea breezes. Morning (afternoon) land (sea) breezes dominate under variable winds, and are more pronounced over leeward Oahu. Most windward stations have an early morning rainfall maximum with a secondary rainfall maximum in the early evening. Furthermore, relatively calm winds are found over central Oahu between the Ko’olau Mountains and the Waianae Mountains, with weak westerly katabatic winds on the windward side of the Waianae Mountains. In the early morning before sunrise, flow deceleration on the windward coastal area is the greatest when the island land surface is the coldest. In this study, characteristics of summer trade wind rainfall over Oahu, Hawaii, are analyzed.
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