According to NOAA, widely scattered debris may show up intermittently along shorelines for a long period of time.
Japan Ministry of the Environment estimated that 5 million tones of debris washed into the ocean and 30% of that debris are still dispersed north and east of the Hawaiian Archipelago.
A NOAA modeling effort shows that some buoyant items have reached the Pacific Northwest coast during winter 2011-2012. More debris is likely still dispersed north of the Main Hawaiian Islands and east of Midway Atoll.
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NOAA anticipates that in the late fall and throughout the winter of 2012-2013, seasonal changes in North Pacific winds and currents will cause marine debris of mixed types to wash ashore on western coastlines of North America. Hawaii can also expect to see mixed debris during this time, since debris will likely travel west toward the Main Hawaiian Island with ocean currents.
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