Question about creating graphics for a plume model

[MarkCollins]

Hello,

I'm trying to create/render the graphics for a plume model. What I would like to do is allow the user to enter a distance for the immediate evacuation zone and a separate distance for the downwind evacuation zone, and also choose wind direction. From this information I would like to render something similar to the attached graphic. I am thinking of using the point buffer to create the initial evacuation zone circle (http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#BufferPoint). What would be the recommend way to create the box (800m) and the sort of cone shaped graphic inside the large square box? Any ideas/comments would be greatly appreciated.

Thanks,
Mark

[dotMorten_esri]

Create a Geoprocessing service that generates the plume and consume that using the Geoprocessing task.
On creating the plume model, see here: http://blogs.esri.com/Dev/blogs/publicsafety/archive/2009/06/15/Emergency-Response-Guide-Geoprocessi...
When you got that working, see the GP samples in the SDK sample on how to consume it.