Hot water

On April 1st, Mochizuki wrote in the Fukushima Diary that the sea water off shore Fukushima is warmer than the average of past 30 years by around 2.5 degrees C   http://fukushima-diary.com/2013/04/sea-water-offshore-fukushima-is-warmer-than-the-average-of-past-30-years-by-2-5%E2%84%83/
This dramatic rise in temperature was also picked up in the Fukushima webcam discussion thread, in ENE news.
On  April 4th, I looked at the Unisys Weather - Sea Surface Temperature Anomalies chart and it was still showing up. This is a map from their archives for April 7th 2013   http://weather.unisys.com/archive/sst/sst_anom-130407.gif
This comes from a very helpful SST anomalies archive provided by Unisys.  You can link to it from the previous map, or follow this link, http://weather.unisys.com/archive/sst/ to a list which is updated about weekly for sea surface temperature anomalies.  I couldn't see anything significant in the March 4th weekly map, or in the weeks just preceding it, but there is clear evidence in the week of March 11th onwards of a temperature rise.
There is also a Unisys Weather - Sea Surface Temperature Anomalies chart  (current)  http://weather.unisys.com/surface/sfc_daily.php?plot=ssa&inv=0&t=cur    and Elders has a an excellent chart of current anomalies,  http://www.eldersweather.com.au
If you are also new to this area, don't forget that these are maps of sea surface temperature anomalies, not overall sea surface temperatures.  It can be a bit confusing!
I don't think that global warming is responsible for this.