I have been listening to the Air Attack plane that is over the Icicle Creek fire near Leavenworth on 171.500 (FM) and also 132.55 (AM).
Fairly good signal in North Seattle, I don't know what altitude they are
orbiting at.
Some links that are useful for Forest Fire info:
The GeoMAC Mapping is pretty good.
http://www.nifc.gov/firemaps.html
For TFR maps and freq info.
http://airspace.nifc.gov/mapping/nifc/index.cfm
For AM status reports and other info such as the Northwest Mobilization Guide (frequencies!).
http://www.or.blm.gov/nwcc/