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So, I read the blog post you attached a link to that explained the PDO in brief.  And, it seemed like a pretty good explainer. 

That said, I had a couple of questions about it: 

1. Based on what you wrote, the PDO is an effect of different processes in the Pacific and in the atmosphere (including ENSO and a warm ocean current in the Western Pacific [I forget the third one - was it the Aleutian low?]).  Is this so?

2. From what was written there, the PDO does not appear to cause any global weather phenomena, though it appears to play a role in local ones.  So, based on the best available evidence, does it contribute to any of them (such as whatever state ENSO is in, how wet or dry the west coast is during the winter, or other regional or global phenomena)?

3. You mentioned writing about a connection between ENSO and the Hadley Cell.  Would you include a link to that post, please?  

Thank you for reading this, and I look forward to hearing from you.