18z GFS is gonna be a day earlier than the AIFS again it looks like. Difference is very clear at ~3 days on the GFS. Again, this is mostly an exercise in my head to reference later to see if the AI is gonna do anything for us this winter, but GFS pushes the energy onshore at like hr66. It gets held back and weakened on the AIFS which lets more cold build in/suppresses things south in the long run. Note the time differences below.