WRT to this event, even though there is ridging up over GL, its not what I would consider an "effective" block for this area. If it were, the 50-50 low wouldn't be hauling ass up into the NA. So in this case we really needed to thread the needle- to time everything perfectly, because that low and the associated confluence (and surface HP) are on the move. We really aren't getting the necessary compressed flow/suppression, which would have inhibited height rises out in front and forced the low track further south.