I check the webcams every morning. The TBS cam looked as if conditions were more stable this morning and the orange bar from yesterday was gone.
Now, one hour later, the TBS cam has gone almost completely dark. The Tepco cam looks normal (albeit 'hot' with green and purple sheen in the emissions) though with no evidence of significant fog/clouds.
Yesterday, Tepco reported another power outage affecting the spent fuel pools (see here).
Is this the reason for the sudden descent of darkness?