Being abnormal is normal for Fukushima.
However, extra ordinary smoke/steam was emit from around reactor 2.
It was 10/22/2011 17:24.(JST)
In the video below,it starts spreading at 1:05.
When it started emitting smoke,it was already dark,so light has nothing to do with the phenomena.
It’s becoming winter. Steam is more visible in this cold air.
This is what comes down to Tokyo by the wind from North.