Well I should say the fronto slopes toward the cold side with height. That prog is averaged in the H6-H8 layer...the strongest lift is H55-H6 which would be north of that averaged frontogenesis.
At least we get the SNE weenies stressing a little bit. They had been having it way too easy with this system. I still expect something closer to the euro/gfs16 to verify. But we shall see.