This has been a bipolar year. The weather is moving into a cooler and wetter regime, but will it be a prolonged pattern change? I guess we'll find out shortly.
I think the QBO was negative during that winter. 1975-76 seems to somewhat match this year, but the niña was stronger in 1975-76. There aren't many 3rd year niñas.
Yes, it was a nino. I remember 2000-01 having a ridge parked in and around the NW after January 1st. Couldn't get rid of that sucker. That year was a 3rd year niña. Anything can happen. It's still early.