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Cliff Mass is a climatologist at UW who has written the book on PNW weather (literally) and his blog - for those of us nerdy enough to follow such things - is the best place to get detailed, yet utterly readable, information about our weather. Cliff says we're not in any danger of radiation problems right now, based on the weather (among other things). You can read his post on why this is the case here
But even it they were heading straight for us..there is little to fear. From virtually a point source, the radiation would mix through huge volumes of the atmosphere due to horizontal and vertical mixing. Since it would take days to reach us, there would be time for larger particles to settle out and precipitation would wash some out as well. Even for Chernobyl, where the core exploded while the reactor was powered up and where there was no containment, serious radiation only extended roughly 1000-1500 km away.