Weather extremes provoked by trapping of giant waves in the atmosphere
02/2572013 - The world has suffered from severe regional weather extremes in
recent years, such as the heat wave in the United States in 2011 or the one
in Russia 2010 coinciding with the unprecedented Pakistan flood. Behind
these devastating individual events there is a common physical cause,
propose scientists of the Potsdam Institute for Climate Impact Research
(PIK). The study will be published this week in the US Proceedings of the
National Academy of Sciences and suggests that man-made climate change
repeatedly disturbs the patterns of atmospheric flow around the globe's
Northern hemisphere through a subtle resonance mechanism.

http://www.pik-potsdam.de/news/press...the-atmosphere

"Scientists were surprised by how far outside past experience some of the
recent extremes have been. The new data show that the emergence of
extraordinary weather is not just a linear response to the mean warming
trend, and the proposed mechanism could explain that."

It sounds as if progress is being made in linking weather and climate
change.

Cheers, Alastair.