I had a -PNA signal in March. The same thing was November, where it was based on SSTs, and PDO stuff, roll-forward (-PNA), we know that Nov turned out like this^, but then December blasted -PNA, maybe we'll see that -PNA again in April?
A -PNA April would be against a developing El Nino (subsurface warming), but based on what we saw last year it may just be a -wave in an otherwise +ENSO trend.
(I think La Nina will be gone completely in 1-2 months.)