I've plotted 500mb height anomalies overlaid with the Pacific Jet for each MJO phase in El Niño years. You can see how jet extension (phases 7/8/1) favors split flow and a Rex block-type pattern over the US. It also constructively interferes with El Niño, leading to pic.twitter.com/ehsb5BgQCu

— Nikhil Trivedi (@DCAreaWx) December 20, 2023