There have been many anomalies recently cited at the Fukushima plant based on observations of the Tepco and TBS/JNN cams.
Additionally, smoke was detected as pouring into a valley from the direction of Fukushima on one of the US stream cams.
I strongly recommend reading the thread here: http://enenews.com/forum-fukushima-webcam-discussion-thread-june-30-2012-present
These anomalies include something that looks like lightning seemingly emanating from the building itself (start watching about 1 minute 22 seconds) (courtesy of Nuckelchen and Still by ChasAha)
http://www.youtube.com/watch?v=OHRnEKfWE70&feature=channel&list=UL&noredirect=1
https://dl.dropbox.com/u/2099954/Rad%20TEPcam%20%20Lightning%20R1%20Tower%20021.jpg
I've been very busy and have only been able to look at the plant periodically but I did capture in screen shots green glows that disappeared throughout the day yesterday: