I watched the Fukushima cams intermittently all day. I have 18 pages of screenshots from the two TEPCO cams, the TBS cam and the Futaba cam, if anyone wants them.
Today's event was significant in terms of its scale. It involved multiple episodes. At least twice when I was watching I saw the steam/fog clear somewhat, only to be followed minutes later by a new surge of emissions.
I'm not sure of the source. Units 1 and 2 were NOT the source of the emissions.
I saw heavy emissions from the area of unit 3 and also emissions from the common spent fuel pool area.
If part of unit 3 reactor fuel is under the building (rather than being in the atmosphere), then perhaps Jec's hypothesis about tidal action can explain some of the surging emissions.
During the few times I checked, Netc did not indicate any elevated rads in the areas closest to Fukushima.
How long would it take for atmospheric emissions in the form of radioactive fog to 'disperse' westward and north?
Finally, this blazing light visible on the Futaba cam at 7:25 AM cannot be from the sun
More screenshots https://www.dropbox.com/s/0g3qlv3ylvcnk4x/August%2013%202014.pdf