Enenews has posted a map plotting location of radioactive water off of North American coast.
http://enenews.com/unpublished-govt-map-shows-massive-plume-fukushima-radioactive-material-west-coast-north-america-radiation-levels-quadrupled-recent-months-scientist-starting-penetration-cesium-offshore-coast-videoThe cesium-137 level is "low," reportedly peaking at 5 becquerels per meter3, but where there is cesium there is likely to be other radionuclide, such as strontium-90s.
5 becquerels per meter3 of cesium-137 is about 5 times more cesium than existed prior to Fukushima.
Is the warm water "blob" merely a euphemism for water warmed by radioactive decay?
Unfortunately its not clear whether the water measuring such elevated cesium is warmer than surrounding, less contaminated water.
Regardless, warm water in the Pacific is a growing scourge that is destroying eco-systems and poses risks to agriculture:
Lucy Craymer, "El Nino Fears Heat Up Agriculture Futures" The Wall Street Journal, October 13, 2015. C4.
[excerpted] The El Nino weather phenomenon is staring to push up prices for agricultural commodities as its impact spreads through key crop-growing regions in Asia and beyond. Government forecasters in the US and Australia have in rcent weeks warned that El Nino could be severest in nearly two decades. Last week the Japan Meteorological Agency said surface temperatures in the Pacific are "remarkably above normal" and warnd temperatures could even reach their highest level since 1950.
Majia here: Ocean temperatures have been rising steadily since 1950 and the beginning of atmospheric testing with Operation Sandstone in 1948:
Dan Vergano, Ocean Warming Faster Now Than in 10,000 Years," National Geographic, November 1 2013, http://news.nationalgeographic.com/news/2013/10/131031-climate-ocean-temperatures-years/
Pacific Ocean waters warmed 15 times faster in the last six decades than they did over the last ten millennia.