Just a bit more SSW stuff, since we are still waiting for viable threats. Check this animation of the SSW event. Rather awesome. And from what I've read, we would prefer a major disturbance that "fragments" the PV, and ultimately not a split. Both can work, but If the split sets up in the wrong places, we could be on the wrong side of the trough. I'd say its akin to a W based NAO that retrogrades and pulls a trough west in the the central US as ridging pops in the east. Its something we want, but in the right places.