The University of Hawaii’s International Pacific Research Center created a
graphic showing the projected dispersion of debris from Japan
Fukushima Radiation Levels Will Concentrate in Pockets at Certain West Coast Locations
An ocean current called the North Pacific Gyre is bringing Japanese radiation to the West Coast of North America:
Physicians for Social Responsibility notes:
An interesting fact for people living on the US west coast is also included in the UNSCEAR [United Nations Scientific Committee on the Effects of Atomic Radiation] report: only about 5% of the directly discharged radiation was deposited within a radius of 80 km from the Fukushima Dai-ichi nuclear power station. The rest was distributed in the Pacific Ocean. 3-D simulations have been carried out for the Pacific basin, showing that within 5–6 years, the emissions would reach the North American coastline, with uncertain consequences for food safety and health of the local population.
Many more graphics at link: http://www.infowars.com/fukushima-is-here/