Answer: eastward. Therefore you have to get acquainted with the phenomenon of the jet stream or jet stream: For our northern hemisphere polar jet stream or Polarfrontjetstream is (PFJ) prevail. The jet stream is a high wind band, which occurs more or less near the Tropic of Cancer.
Northern and Southern tropic and equator (Source: Wikimedia Commons)
He is a West Wind, because he comes from the west and go east. Aircraft use the Jet for Kraftstoffersparen.
In this graph, the California Regional Weather Server, you can see how the North Pacific Jet Stream is moving over the Pacific Ocean on the West Coast of the United States and in what states it approximately occurs first.
Graphics on the progress of the North Pacific jet stream and its arrival in the United States (Source: California Regional Weather Server)
Here a weather model with wind forecast of Stormsurfing.com. It shows clearly how the possible exposure to radioactivity bearing Jet moving from west to east. Over the North Atlantic, he seems to be getting somewhat split into a northern portion, which attracts more about Scandinavia and a southerly current that runs through North Africa. Central Europe with Germany remains a little left out.
In the Central Institute for Meteorology and Geodynamics (Vienna) can be also a wealth of data, graphics and information relating to the expected distribution of radioactivity retrieve . Forecasts are updated constantly.
The German Federal Office for Radiation Protection has also provided a vivid graphics with the simulation of atmospheric dispersion of radiation from Japan into the grid (see below).
There is in Germany the Integrated Measurement and Information System (IMIS). It delivers every 24 hours actual measured values for gamma-radiation. You can query the individual stations on a map of Germany by clicking.
Germany: Radioactivity Monitoring Network (measurement data of the Federal Office for Radiation Protection)
Spread of the radioactive cloud from Japan starting (source: ZAMG (Austrian Ministry of the Interior).)
Simulation: spread of radiation from Fukushima (Source: Federal Office for Radiation Protection)
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Tags: nuclear disaster Japan , Federal Office for Radiation Protection , Jet Stream , where does the radioactivity , Central Institute for Meteorology and Geodynamics
In addition to the contribution must be said that the German Weather Service has issued directives to the stations on 16 March this country to publish no more data regarding radioactivity. Basically a scandal. In N24 this was confirmed by an expert of the Society for Radiological Protection: http://www.youtube.com/watch?v=hAmKPOSicgo
Also, the investigative journalist Gerhard Wisnewski has reported on and makes the data available on his website: http://www.wisnewski.de/ (left column).