Other Useful Links
National Weather Service's forecast for the Lilburn area.
Lilburn Snow Information and Forecast
NOAA's Interactive Snow Information for the PRGC1 (Park Ridge) weather station. Not quite in Redwood Canyon, but it has tracked well in the past with how the conditions at the bottom of the canyon are, even if it's at a lower elevation.
Webcams in areas near Redwood Canyon. Could be useful for trip planning purposes (weather, clothing, etc).