18z GFS has a more poleward shifted pacific jet as it enters the US, something that’s not really supported atm. Poleward is bad, equatorial shifted = possibly warm, but also the risk of undercutting and stuff dropping on the east side of the omega block. Still with a eq shifted pac jet, there’s a warm risk, but an increased chance of lower heights below the ridge. Think what gets my interest the most is ENS towards the end starting to get those looks the EC weeklies/GEFS ext show with blocking everything up top especially getting the western Canada/Alaska ridge going and lowering the height field below