I've seen a lot of jet stream forcasts and this page pretty much sums them all up. This isn't some illustration drawn up to scare people either. This is just the weather pattern across the world here.
Wind and jet stream pattern map. This pattern shows the direction that the contamination will follow (already has?). I believe there are some educated people behind this as well.. not just one person typing out a blog. There are many other news sources but
AH blog has been posting about the news that is more key to basic human survival while pointing out historic blunders. History repeats itself over and over IMO.