I agree, the SW, US warm season temperature change and drought since 1995 is a major variable in the global warming puzzle. It's become pretty clear that the mean jet stream has shifted north - San Francisco used to get a lot more rain than they do now, and it makes sense that it would impact the NW, US eventually, but more in the warm season as there is less variation from volatility. I remember in the 90s and 2000s, everyone was expecting more El Nino's and +PDO from global warming, but the opposite has happened in the Pacific decadal state over the last 27 years. So I'm not so sure an east coast trough is the favored pattern going forward, but I do think this Winter is a pretty good indicator of the warming general in the mid latitudes. The Rockies ridge is pretty independent of the longer wavelength pattern.