There's still ample time for things to play out... but given that the GFS & ECMWF were worlds apart with the 500mb vorticity evolution, it's notable that the 18z GFS took a substantial step *towards the ECMWF* with a much more progressive and flatter trough: pic.twitter.com/GOkCzWbTN1

— Tomer Burg (@burgwx) January 12, 2024