A special report "Explaining extreme events of 2013 from a climate perspective" has been published today in the Bulletin of the American Meteorological Society. The authors claim to "link" some extreme heat waves to anthropogenic global warming, but not other extreme weather including droughts, heavy rain, and storms.
"In this paper, 20 different research groups explored the causes of 16 different events that occurred in 2013.The findings indicate that human-caused climate change greatly increased the risk for the extreme heat waves assessed in this report. How human influence affected other types of events such as droughts, heavy rain events, and storms was less clear, indicating that natural variability likely played a much larger role in these extremes."Thus, as noted today on twitter by Dr. Roger Pielke Jr, "the bottom line on this new NOAA special report: If you are attributing any extreme other than heat waves to Anthropogenic Climate Change, you are on weak (or worse) scientific ground."