Ugh you are incorrect.
This was a record west coast trough and a strongly coupled La Nina. We do not snow in March in strong la Ninas.
We love El Ninos, but a strong El Nino like 97/98 we had perfect benchmark tracks and they all failed as it was too strong. Same here with the la Nina.
You are broad brushing Nina's which is 100% incorrect. Yes we snow in March in a weaker Nina. This year was historic.