I've been gone all day at work so I've not had time to follow up on this yellow fog.
I saw it on the Tepco webcam this morning. It must have been around 7:30 or 8:00 a.m. Arizona time 5/3.
The yellow fog was unprecedented and very scary. It looked toxic.
I did not see it actually go away.
I had to make the kids' breakfast, and when I came back to check the video cam, the yellow fog was gone.
Luckily Fukushima Diary has some good captures ( I took a few screen shots ).
Fukushima Diary is also noting municipal readings of Iodine-131.
Has all hell broken lose at Fukushima?