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)
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: