That is a good point about longest streak of 10 years without deep La Nina..
-PNA is record setting, +400dm coming up. This Sept/Oct is going to be most -PDO, meaning Aleutian ridge/GOA trough since satellites in 1948. The analogs are Strong El Nino's and Strong La Nina's, 04-05 broke the trend, moving to -PNA, it's 65% Strong events(+/-). But this is as "deep Nina" as we are going to get (models through October). -400dm -PNA, and close to -200dm for a Sept/Oct composite.