So anyone have any knowledge about weather dynamics in the high latitudes? How cold or not it is down here is largely a function of how much or how little arctic air we get shunted our way. But factors control how cold or mild the source regions are?
Just naively, I might think that it is the inverse of the mid-latitudes. By that I mean, that high latitudes will tend to be mild if there is a large amount of arctic air transported down south, and will tend to be cold if they get isolated from the mids. Under that theory I would expect the arctic regions to be cold in a +AO, because they are isolated from the mids. Conversely, in a -AO, I would expect the source regions to be mild since they are constantly loosing cold to the south.
But I don't consistently see that sort of anomaly pattern. Seems more often for anomalies to hemispherically correlated, or meridianally correlated.
Its something I have been wondering about for a long time.