|The PNA - Notice the +PNA corresponded to our cold spell in late October|
So what do we make of all this?
First, the atmosphere is an inherently complex and chaotic system. A few teleconnections, while a good tool to use, rarely tell the complete story unless the indices are extreme to one side or the other.
Secondly, there is a distinct trend for the AO and NAO to sag into "cooler, troughy" territory. But for a colder, snowy pattern to develop, the numbers would have to go decisively negative which isn't shown here. The PNA is trending the other direction from the levels (strongly positive) during our brief lake effect snow event in late October. PNA sharply negative indicates a ridge (milder temps) in the east NOT cooler.
So we might have to wait a few weeks for cold enough air to bring a good lake effect snow event.