See the thing that is interesting is that we are seeing cooling in the middle part of the Pacific in the ENSO regions while having warming near South America
This leads to a very positive Trans-Nino Index, which is very conducive to severe in the US, combine that with the -PDO (cooling along Alaska/California along with warmth to the west of it, and an above average Gulf of Mexico. You present a very ripe pattern for western US troughing and strong return flow into the middle part of the country, with above normal moisture. Many of your first year Ninas that decay or weaken in this time frame tend to be blockbuster years. There are exceptions of 2006 but this winter/spring has not played out like that year.