Some of them may only visit the canyon once in their lives. They can't see it or enjoy the hike down to the bottom.

though they also are seeing a very rare event.

layer they could see everything just fine. Not as a good as on a sunny day though. Visibility in the fog should be good enough for the outfitters and mules and hikers.

I live in the Lewis-Clark Valley in Idaho. It's not all that rare to see a view like that from the top of The Lewiston Hill. Not as cool as it happening at The Grand Canyon though. I left here one time on a day like that and it was 16 degrees. It's about a 2000 ft climb driving up the hill onto The Palouse Prairie. Once in the sunshine it was too warm and I had to turn the heat in my truck off. Wearing sweats for the drive I was still a little too warm. By the time I stopped in Colfax, WA about an hour away, I got out at a convenience store and couldn't believe it. It was about 40 degrees there. We don't get that much of a cold air inversion very often. I hear that happens down in Boise quite a bit.

And I don't know if the cloud goes all the way down to the bottom. Still with the cloud or fog it would detract greatly from the experience in my view.

through it pretty quickly. It would ruin the effect of the colors of the canyon walls for sure but you'd get some unique pics. Shooting up at the layer or taking pics on the trail just as you come through it.

On Wednesday we were driving on US160 West from NM border to the east end of the Grand Canyon. The entire area was hit with this "fog". We were in Monument Valley area and couldn't really see anything above 100ft ground level or half mile in distance. Still pretty but disappointing. Similar to when we went to Bryce Canyon in early winter of 1998. Pretty foggy around and we paid our entrance fee, not a soul told us that it might be a problem seeing anything that day. Sure enough, we sat at the edge of the Canyon and saw nothing but fog. I had seen it before but my wife hadn't and we will probably never be back. A miss for sure and not irritated at the weather but the fact that the entrance people didn't warn us before we paid our fee......