David Middleton is hot and bothered by the spurt and the Pacific Decadal Oscillation

As you know, Anthony Watts (quite wisely) mostly uses guests to write freeby articles for his blog. He gets into too much trouble when he tries to write something all by himself. Anthony doesn't need to determine whether his guests write nonsense or not. His good friend Wondering Willis Eschenbach gave him an "out" writing: "So it is not Anthony’s job to determine whether or not the work of the guest authors will stand the harsh light of public exposure. That’s the job of the peer reviewers, who are you and I and everyone making defensible supported scientific comments. Even if Anthony had a year to analyze and dissect each piece, he couldn’t do that job..." Yes, even his close allies think Anthony's incapable of distinguishing pseudo-scientific waffle from science.

Today Anthony's posted another article by David Middleton. This time David is waffling on about the Pacific Decadal Oscillation (PDO). The PDO is measured by an index. As Kevin Trenberth explained it in a recent Perspective article in Science (my paras):