I don't really see the significance of that...February 2000 had a very strong +PNA like this one (calculation), so why don't we consider the winter following that? Only Bluewave could reframe a shift towards +PNA after the most prominent several year stretch of RNA on record as a negative for winter.
I know John as noticed this, too....we have had zero issues scoring epic winter patterns over the course of this torturous last several years......during the spring.
That is quite a run there early last decade considering the strong modern predisposition towards +NAO....3/4 years with a mean DM -NAO. Hopefully due for another stretch like that soon. Approaching solar min near the turn of the decade should help.
Oh yes...I was focused on cool ENSO.
Yea, I was being generous, so I included anything with a mean negative value. Yes, missed 2012-2013, as well....I listed those seasons based on a very cursory glance, so thanks for the corrections
I definitely dive pretty deeply into it in the blog...but I think the predominant +WPO is tied into the west PAC warm pool. I think the NAO is being impacted by CC because we hardly ever have DM seasons that average -NAO anymore. Last season was predicatable due to solar max, but even beyond that...the ceiling is like one month averaging neg NAO lol. This century, only 2000-2001, 2010-2011 and 2020-2021 have pulled it off.
The WPO and the NAO were the main issue last season....EPO/PNA supplied seasonal cold, but major storms still either tracked inland, or failed to phase because the PNA ridge would get throttled. Only time the NAO played ball in January it ended up a suppressive detriment.
I think the key for this season is finally flip the WPO....since 2016-2017, which was mild for other reasons....we have only had one -WPO season, which was 2021-2022...no suprise that was our one KU over the course of the last several years.