That is it, plus a strong Pac jet, at least to this point. Yes we want a trough out there, but not a massive vortex sitting in the GoA. That is one way to get Pac air loaded into our source region. Problem is the base state in a Nina is not like it is in a Nino, so it is more difficult to keep a "moderate" vortex back towards the Aleutians. Upshot is we are always up against it on the PAC side in a Nina. Without maintaining a perfect balance, we end up being fire hosed either way. I think it is more hostile lately than in previous years. That is another topic for another thread.