starsfan65 wrote:how long is the PNA is going to be positive?TheProfessor wrote:I'm late to the discussion, but one thing about teleconnections (and I've mentioned this before iirc) is that how they trend is just as important as where it is on the graph. In the midterm the PNA is expected to trend positive, but then that trend becomes more neutral or even slightly negative, which would favor us. A low amplitude negative trend isn't a bad deal for us as long as the AO, EPO, and NAO aren't going in the wrong direction too. It does seem like we could see what Ntxw was mentioning with the cold air sliding east at first and then retrograding westward with time.
PNA is actually negative now and doesn't start trending positive until this week (with this front). From there it just kind of flattens out or trends slightly negative, but that forecast is uncertain.