In order for this window to work out for the lowlands, wave timing/spacing is especially critical, given there isn't a sustained block in place and cold air availability is marginal. Comparing this GFS run to the ones with the better outcomes, there is a bit too much spacing relative to the 50-50 vortex, and ofc the shortwave itself is stronger/ more amped. That might work if there was a block, but it becomes really touchy in this case wrt the 50-50 position/strength. Anyway, still plenty of time and a pretty good bet guidance doesn't have the details nailed down at this juncture.