If you compare the GFS & Euro the Eastern US is pretty similar, high pressure placement almost identical and only 4 MB difference. However the GFS is showing major difference to the west, the high over ID is considerably weaker on the GFS and it's bringing a low pressure into the Pac NW about 12 hours sooner.
Just seems to be one of those solutions that until we get to sampling will produce some wild differences as there's so many pieces of energy throwing the models off. It's my opinion that the GFS is clearly not handling this well