This definitely gonna be nowcasting. The meso models have the low getting further and closer to us before transferring. The gfs and cmc have it transferring earlier. It could be all model noise but these little details matter for us.
It seems like it's all meso models want to take the low closer to us which brings the rates but also the mix line. It's never easy for us.
My gut tells me the 18z HRRR and NAMs head more toward the gfs and cmc but who knows.