National Weather Service Infrared Loop:
See an animation over the next few days: http://squall.sfsu.edu/scripts/namjetstream_modelsml.html
*Select length of animation at the top, then click build animation to view.
Analysis made from NOAA Split Trajectory Model
http://www.wunderground.com/blog/JeffMasters/show.html is saying that “Traces of radioactive substances emitted by Japan’s damaged Fukushima nuclear power plant will likely arrive over the Western U.S. today, carried by the prevailing west to east winds that have blown over the Pacific Ocean during the past week. Rainfall is expected over California this weekend, and it is likely that the rain will wash radioactive particles out of the air to the surface in quantities that will be detectable at several locations. Radioactivity from Japan arriving over the U.S. over the next few days poses absolutely no threat to human health.”
*This shows weather patterns only. The numbers on the map are the temperature.
About the Jet Stream: http://www.srh.noaa.gov/jetstream/global/jet.htm
Forecast by the Comprehensive Nuclear Test Ban Treaty Organization: http://www.nytimes.com/interactive/2011/03/16/science/plume-graphic.html?ref=science (animation *click play at the top).
*Click the date on the bottom to see jet stream projections.