I was driving on i-5 south from marysville into everett and i saw a very large glowing orb in the sky, the biggest i have seen (likely due to it being the closest i have seen). my perception of the size from where i was made it seem to be about 30ft diameter while it was glowing the most. it was about 5:35 that i noticed it and i was about a mile past exit 199. the color was orange/ copper. at fist it was stationary in the sky, then the glow got bigger and it moved west. from where i was on the freeway it seemed like the craft was almost directly above the everett navy base (about 1 mile from me). once it got to that position it looked like it stopped moving and slowly started to fade until it got very faint, stayed that way briefly and then it was gone.