November 2019 looks set to be dominated by a strongly negative AO/NAM pattern. Historically, the most recent strongly negative November-mean AO was actually only last year - but before that, 2002 (also a QBO analog) was strongly negative (...and a major SSW followed in Jan 2003). pic.twitter.com/lzDLzJCgBV

— Dr Simon Lee (@SimonLeeWx) November 12, 2019