A bunch of you probably remember the December +AO post I made last year and the subsequent discussion. For those who don't remember, the short version is a big anomalous +AO in Dec is tough to break down and it screws up the first have of winter with ease. I'm sure most on here know what the different phases of the AO look like but I figured it would be best to post anom maps so those who only know the AO as a # can see what it looks like in the atmosphere. Negative AO: Positive AO: Pretty e