Weather authorities say the islands of Guam, Palau, the Federated States of Micronesia, the Marshall Islands and the Northern Marianas will not be affected by any low level radiation leaked from Japan's nuclear power plants in the next few weeks.
The National Weather Forecast Office in Guam, which forecasts for those islands, says in a couple of months winds from Asia and Japan could come down into the area.
But the centre's warning coordination meteorologist Chip Guard says at present the winds would carry any radiation away.
"Right now it looks like our islands are in good shape and probably for any kind of low level radiation, probably going to hang out in unpopulated parts of the ocean."
Chip Guard says if there was a big nuclear explosion it would release material higher into the atmosphere that could cause other concerns.
But he says there would probably still be no effect on Micronesia for the next few weeks.