How the hell. I'm in Seattle and watched it and it was so faint, barely visible at all. You wouldn't have even noticed it if you weren't looking for it.
Surprisingly, even mid-tier phone cameras can take amazing pictures when the naked eye can barely see anything. To me, it looked like barely visible wispy gray-green clouds, but the pictures on my phone are far more vibrant.
Probably too much light pollution. Unless you're far away from any light it's difficult to see with the naked eye. Try taking a picture with a long exposure (just a couple seconds should do it). You'll want to be looking North and they can change in intensity through the night but I was able to get some good photos around 11:30.