Looking at the 12k, I think we can toss the surface depiction. Play the loop quickly. Something is wrong - likely some sort of feedback issue. I thought it was picking up on some convective nuances with the splotchiness but it actually just looks like it spazzes out and glitches.
Surface depiction for the NAM is very similar to 18z, but again, it’s another model that looks improved under the hood. The ridge out west keeps trending taller, helping the shortwave drop a bit further before it scoots east.
Clearing skies and wet grass, that frost is going to be serious. I’ll be close to passing my seasonal totals of late with just a few more chilly mornings.