recent study by University of Hawai'i at Mānoa researchers determined that heavy rainfall events have become more frequent over the last 50 years on Hawai'i Island. For instance, a rare storm with daily precipitation of nearly 12 inches, occurring once every 20 years by 1960, has become a rather common storm event on the Big Island of Hawai'i -- returning every 3-5 years by 2009.
While heavy rainfall events have become more frequent over the last 50 years on the easternmost island in Hawai'i, the opposite behavior is observed for Oʻahu and Maui to the west. There, rainfall extremes have become less frequent in the last five decades. This study, therefore, also reveals a regional -- that is, east to west -- difference in how precipitation patterns are responding to a changing climate.
http://www.sciencedaily.com/releases/2015/02/150205095237.htm
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